super.c 158.0 KB
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/*
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 *  linux/fs/ext4/super.c
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 *
 * Copyright (C) 1992, 1993, 1994, 1995
 * Remy Card (card@masi.ibp.fr)
 * Laboratoire MASI - Institut Blaise Pascal
 * Universite Pierre et Marie Curie (Paris VI)
 *
 *  from
 *
 *  linux/fs/minix/inode.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  Big-endian to little-endian byte-swapping/bitmaps by
 *        David S. Miller (davem@caip.rutgers.edu), 1995
 */

#include <linux/module.h>
#include <linux/string.h>
#include <linux/fs.h>
#include <linux/time.h>
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#include <linux/vmalloc.h>
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#include <linux/jbd2.h>
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#include <linux/slab.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/parser.h>
#include <linux/buffer_head.h>
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#include <linux/exportfs.h>
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#include <linux/vfs.h>
#include <linux/random.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/quotaops.h>
#include <linux/seq_file.h>
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#include <linux/proc_fs.h>
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#include <linux/ctype.h>
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#include <linux/log2.h>
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#include <linux/crc16.h>
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#include <linux/cleancache.h>
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#include <asm/uaccess.h>

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#include <linux/kthread.h>
#include <linux/freezer.h>

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#include "ext4.h"
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#include "ext4_extents.h"	/* Needed for trace points definition */
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#include "ext4_jbd2.h"
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#include "xattr.h"
#include "acl.h"
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#include "mballoc.h"
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#define CREATE_TRACE_POINTS
#include <trace/events/ext4.h>

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static struct proc_dir_entry *ext4_proc_root;
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static struct kset *ext4_kset;
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static struct ext4_lazy_init *ext4_li_info;
static struct mutex ext4_li_mtx;
static struct ext4_features *ext4_feat;
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static int ext4_mballoc_ready;
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static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
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			     unsigned long journal_devnum);
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static int ext4_show_options(struct seq_file *seq, struct dentry *root);
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static int ext4_commit_super(struct super_block *sb, int sync);
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static void ext4_mark_recovery_complete(struct super_block *sb,
					struct ext4_super_block *es);
static void ext4_clear_journal_err(struct super_block *sb,
				   struct ext4_super_block *es);
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static int ext4_sync_fs(struct super_block *sb, int wait);
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static int ext4_sync_fs_nojournal(struct super_block *sb, int wait);
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static int ext4_remount(struct super_block *sb, int *flags, char *data);
static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
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static int ext4_unfreeze(struct super_block *sb);
static int ext4_freeze(struct super_block *sb);
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static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
		       const char *dev_name, void *data);
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static inline int ext2_feature_set_ok(struct super_block *sb);
static inline int ext3_feature_set_ok(struct super_block *sb);
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static int ext4_feature_set_ok(struct super_block *sb, int readonly);
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static void ext4_destroy_lazyinit_thread(void);
static void ext4_unregister_li_request(struct super_block *sb);
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static void ext4_clear_request_list(void);
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static int ext4_reserve_clusters(struct ext4_sb_info *, ext4_fsblk_t);
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#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
static struct file_system_type ext2_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "ext2",
	.mount		= ext4_mount,
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};
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MODULE_ALIAS_FS("ext2");
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MODULE_ALIAS("ext2");
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#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
#else
#define IS_EXT2_SB(sb) (0)
#endif


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#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
static struct file_system_type ext3_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "ext3",
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	.mount		= ext4_mount,
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	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};
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MODULE_ALIAS_FS("ext3");
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MODULE_ALIAS("ext3");
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#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
#else
#define IS_EXT3_SB(sb) (0)
#endif
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static int ext4_verify_csum_type(struct super_block *sb,
				 struct ext4_super_block *es)
{
	if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
					EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
		return 1;

	return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
}

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static __le32 ext4_superblock_csum(struct super_block *sb,
				   struct ext4_super_block *es)
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	int offset = offsetof(struct ext4_super_block, s_checksum);
	__u32 csum;

	csum = ext4_chksum(sbi, ~0, (char *)es, offset);

	return cpu_to_le32(csum);
}

int ext4_superblock_csum_verify(struct super_block *sb,
				struct ext4_super_block *es)
{
	if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
		return 1;

	return es->s_checksum == ext4_superblock_csum(sb, es);
}

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void ext4_superblock_csum_set(struct super_block *sb)
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{
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	struct ext4_super_block *es = EXT4_SB(sb)->s_es;

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	if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
		EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
		return;

	es->s_checksum = ext4_superblock_csum(sb, es);
}

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void *ext4_kvmalloc(size_t size, gfp_t flags)
{
	void *ret;

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	ret = kmalloc(size, flags | __GFP_NOWARN);
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	if (!ret)
		ret = __vmalloc(size, flags, PAGE_KERNEL);
	return ret;
}

void *ext4_kvzalloc(size_t size, gfp_t flags)
{
	void *ret;

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	ret = kzalloc(size, flags | __GFP_NOWARN);
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	if (!ret)
		ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
	return ret;
}

void ext4_kvfree(void *ptr)
{
	if (is_vmalloc_addr(ptr))
		vfree(ptr);
	else
		kfree(ptr);

}

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ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
			       struct ext4_group_desc *bg)
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{
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	return le32_to_cpu(bg->bg_block_bitmap_lo) |
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		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
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		 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
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}

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ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
			       struct ext4_group_desc *bg)
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{
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	return le32_to_cpu(bg->bg_inode_bitmap_lo) |
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		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
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		 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
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}

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ext4_fsblk_t ext4_inode_table(struct super_block *sb,
			      struct ext4_group_desc *bg)
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{
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	return le32_to_cpu(bg->bg_inode_table_lo) |
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		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
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		 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
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}

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__u32 ext4_free_group_clusters(struct super_block *sb,
			       struct ext4_group_desc *bg)
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{
	return le16_to_cpu(bg->bg_free_blocks_count_lo) |
		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
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		 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
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}

__u32 ext4_free_inodes_count(struct super_block *sb,
			      struct ext4_group_desc *bg)
{
	return le16_to_cpu(bg->bg_free_inodes_count_lo) |
		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
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		 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
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}

__u32 ext4_used_dirs_count(struct super_block *sb,
			      struct ext4_group_desc *bg)
{
	return le16_to_cpu(bg->bg_used_dirs_count_lo) |
		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
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		 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
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}

__u32 ext4_itable_unused_count(struct super_block *sb,
			      struct ext4_group_desc *bg)
{
	return le16_to_cpu(bg->bg_itable_unused_lo) |
		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
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		 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
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}

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void ext4_block_bitmap_set(struct super_block *sb,
			   struct ext4_group_desc *bg, ext4_fsblk_t blk)
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{
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	bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
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	if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
		bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
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}

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void ext4_inode_bitmap_set(struct super_block *sb,
			   struct ext4_group_desc *bg, ext4_fsblk_t blk)
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{
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	bg->bg_inode_bitmap_lo  = cpu_to_le32((u32)blk);
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	if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
		bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
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}

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void ext4_inode_table_set(struct super_block *sb,
			  struct ext4_group_desc *bg, ext4_fsblk_t blk)
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{
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	bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
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	if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
		bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
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}

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void ext4_free_group_clusters_set(struct super_block *sb,
				  struct ext4_group_desc *bg, __u32 count)
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{
	bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
	if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
		bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
}

void ext4_free_inodes_set(struct super_block *sb,
			  struct ext4_group_desc *bg, __u32 count)
{
	bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
	if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
		bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
}

void ext4_used_dirs_set(struct super_block *sb,
			  struct ext4_group_desc *bg, __u32 count)
{
	bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
	if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
		bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
}

void ext4_itable_unused_set(struct super_block *sb,
			  struct ext4_group_desc *bg, __u32 count)
{
	bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
	if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
		bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
}

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static void __save_error_info(struct super_block *sb, const char *func,
			    unsigned int line)
{
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;

	EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
	es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
	es->s_last_error_time = cpu_to_le32(get_seconds());
	strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
	es->s_last_error_line = cpu_to_le32(line);
	if (!es->s_first_error_time) {
		es->s_first_error_time = es->s_last_error_time;
		strncpy(es->s_first_error_func, func,
			sizeof(es->s_first_error_func));
		es->s_first_error_line = cpu_to_le32(line);
		es->s_first_error_ino = es->s_last_error_ino;
		es->s_first_error_block = es->s_last_error_block;
	}
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	/*
	 * Start the daily error reporting function if it hasn't been
	 * started already
	 */
	if (!es->s_error_count)
		mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
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	le32_add_cpu(&es->s_error_count, 1);
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}

static void save_error_info(struct super_block *sb, const char *func,
			    unsigned int line)
{
	__save_error_info(sb, func, line);
	ext4_commit_super(sb, 1);
}

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/*
 * The del_gendisk() function uninitializes the disk-specific data
 * structures, including the bdi structure, without telling anyone
 * else.  Once this happens, any attempt to call mark_buffer_dirty()
 * (for example, by ext4_commit_super), will cause a kernel OOPS.
 * This is a kludge to prevent these oops until we can put in a proper
 * hook in del_gendisk() to inform the VFS and file system layers.
 */
static int block_device_ejected(struct super_block *sb)
{
	struct inode *bd_inode = sb->s_bdev->bd_inode;
	struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info;

	return bdi->dev == NULL;
}

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static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
{
	struct super_block		*sb = journal->j_private;
	struct ext4_sb_info		*sbi = EXT4_SB(sb);
	int				error = is_journal_aborted(journal);
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	struct ext4_journal_cb_entry	*jce;
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	BUG_ON(txn->t_state == T_FINISHED);
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	spin_lock(&sbi->s_md_lock);
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	while (!list_empty(&txn->t_private_list)) {
		jce = list_entry(txn->t_private_list.next,
				 struct ext4_journal_cb_entry, jce_list);
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		list_del_init(&jce->jce_list);
		spin_unlock(&sbi->s_md_lock);
		jce->jce_func(sb, jce, error);
		spin_lock(&sbi->s_md_lock);
	}
	spin_unlock(&sbi->s_md_lock);
}
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/* Deal with the reporting of failure conditions on a filesystem such as
 * inconsistencies detected or read IO failures.
 *
 * On ext2, we can store the error state of the filesystem in the
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 * superblock.  That is not possible on ext4, because we may have other
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 * write ordering constraints on the superblock which prevent us from
 * writing it out straight away; and given that the journal is about to
 * be aborted, we can't rely on the current, or future, transactions to
 * write out the superblock safely.
 *
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 * We'll just use the jbd2_journal_abort() error code to record an error in
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 * the journal instead.  On recovery, the journal will complain about
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 * that error until we've noted it down and cleared it.
 */

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static void ext4_handle_error(struct super_block *sb)
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{
	if (sb->s_flags & MS_RDONLY)
		return;

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	if (!test_opt(sb, ERRORS_CONT)) {
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		journal_t *journal = EXT4_SB(sb)->s_journal;
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		EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
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		if (journal)
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			jbd2_journal_abort(journal, -EIO);
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	}
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	if (test_opt(sb, ERRORS_RO)) {
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		ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
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		/*
		 * Make sure updated value of ->s_mount_flags will be visible
		 * before ->s_flags update
		 */
		smp_wmb();
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		sb->s_flags |= MS_RDONLY;
	}
	if (test_opt(sb, ERRORS_PANIC))
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		panic("EXT4-fs (device %s): panic forced after error\n",
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			sb->s_id);
}

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#define ext4_error_ratelimit(sb)					\
		___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state),	\
			     "EXT4-fs error")

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void __ext4_error(struct super_block *sb, const char *function,
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		  unsigned int line, const char *fmt, ...)
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{
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	struct va_format vaf;
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	va_list args;

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	if (ext4_error_ratelimit(sb)) {
		va_start(args, fmt);
		vaf.fmt = fmt;
		vaf.va = &args;
		printk(KERN_CRIT
		       "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
		       sb->s_id, function, line, current->comm, &vaf);
		va_end(args);
	}
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	save_error_info(sb, function, line);
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	ext4_handle_error(sb);
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}

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void __ext4_error_inode(struct inode *inode, const char *function,
			unsigned int line, ext4_fsblk_t block,
			const char *fmt, ...)
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{
	va_list args;
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	struct va_format vaf;
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	struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
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	es->s_last_error_ino = cpu_to_le32(inode->i_ino);
	es->s_last_error_block = cpu_to_le64(block);
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	if (ext4_error_ratelimit(inode->i_sb)) {
		va_start(args, fmt);
		vaf.fmt = fmt;
		vaf.va = &args;
		if (block)
			printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
			       "inode #%lu: block %llu: comm %s: %pV\n",
			       inode->i_sb->s_id, function, line, inode->i_ino,
			       block, current->comm, &vaf);
		else
			printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
			       "inode #%lu: comm %s: %pV\n",
			       inode->i_sb->s_id, function, line, inode->i_ino,
			       current->comm, &vaf);
		va_end(args);
	}
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	save_error_info(inode->i_sb, function, line);
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	ext4_handle_error(inode->i_sb);
}

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void __ext4_error_file(struct file *file, const char *function,
		       unsigned int line, ext4_fsblk_t block,
		       const char *fmt, ...)
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{
	va_list args;
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	struct va_format vaf;
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	struct ext4_super_block *es;
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	struct inode *inode = file_inode(file);
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	char pathname[80], *path;

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	es = EXT4_SB(inode->i_sb)->s_es;
	es->s_last_error_ino = cpu_to_le32(inode->i_ino);
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	if (ext4_error_ratelimit(inode->i_sb)) {
		path = d_path(&(file->f_path), pathname, sizeof(pathname));
		if (IS_ERR(path))
			path = "(unknown)";
		va_start(args, fmt);
		vaf.fmt = fmt;
		vaf.va = &args;
		if (block)
			printk(KERN_CRIT
			       "EXT4-fs error (device %s): %s:%d: inode #%lu: "
			       "block %llu: comm %s: path %s: %pV\n",
			       inode->i_sb->s_id, function, line, inode->i_ino,
			       block, current->comm, path, &vaf);
		else
			printk(KERN_CRIT
			       "EXT4-fs error (device %s): %s:%d: inode #%lu: "
			       "comm %s: path %s: %pV\n",
			       inode->i_sb->s_id, function, line, inode->i_ino,
			       current->comm, path, &vaf);
		va_end(args);
	}
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	save_error_info(inode->i_sb, function, line);
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	ext4_handle_error(inode->i_sb);
}

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const char *ext4_decode_error(struct super_block *sb, int errno,
			      char nbuf[16])
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{
	char *errstr = NULL;

	switch (errno) {
	case -EIO:
		errstr = "IO failure";
		break;
	case -ENOMEM:
		errstr = "Out of memory";
		break;
	case -EROFS:
518 519
		if (!sb || (EXT4_SB(sb)->s_journal &&
			    EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538
			errstr = "Journal has aborted";
		else
			errstr = "Readonly filesystem";
		break;
	default:
		/* If the caller passed in an extra buffer for unknown
		 * errors, textualise them now.  Else we just return
		 * NULL. */
		if (nbuf) {
			/* Check for truncated error codes... */
			if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
				errstr = nbuf;
		}
		break;
	}

	return errstr;
}

539
/* __ext4_std_error decodes expected errors from journaling functions
540 541
 * automatically and invokes the appropriate error response.  */

542 543
void __ext4_std_error(struct super_block *sb, const char *function,
		      unsigned int line, int errno)
544 545 546 547 548 549 550 551 552 553 554
{
	char nbuf[16];
	const char *errstr;

	/* Special case: if the error is EROFS, and we're not already
	 * inside a transaction, then there's really no point in logging
	 * an error. */
	if (errno == -EROFS && journal_current_handle() == NULL &&
	    (sb->s_flags & MS_RDONLY))
		return;

555 556 557 558 559
	if (ext4_error_ratelimit(sb)) {
		errstr = ext4_decode_error(sb, errno, nbuf);
		printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
		       sb->s_id, function, line, errstr);
	}
560

561
	save_error_info(sb, function, line);
562
	ext4_handle_error(sb);
563 564 565
}

/*
566
 * ext4_abort is a much stronger failure handler than ext4_error.  The
567 568 569 570 571 572 573 574
 * abort function may be used to deal with unrecoverable failures such
 * as journal IO errors or ENOMEM at a critical moment in log management.
 *
 * We unconditionally force the filesystem into an ABORT|READONLY state,
 * unless the error response on the fs has been set to panic in which
 * case we take the easy way out and panic immediately.
 */

575
void __ext4_abort(struct super_block *sb, const char *function,
576
		unsigned int line, const char *fmt, ...)
577 578 579
{
	va_list args;

580
	save_error_info(sb, function, line);
581
	va_start(args, fmt);
582 583
	printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
	       function, line);
584 585 586 587
	vprintk(fmt, args);
	printk("\n");
	va_end(args);

588 589 590
	if ((sb->s_flags & MS_RDONLY) == 0) {
		ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
		EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
591 592 593 594 595 596
		/*
		 * Make sure updated value of ->s_mount_flags will be visible
		 * before ->s_flags update
		 */
		smp_wmb();
		sb->s_flags |= MS_RDONLY;
597 598 599 600
		if (EXT4_SB(sb)->s_journal)
			jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
		save_error_info(sb, function, line);
	}
601
	if (test_opt(sb, ERRORS_PANIC))
602
		panic("EXT4-fs panic from previous error\n");
603 604
}

605 606
void __ext4_msg(struct super_block *sb,
		const char *prefix, const char *fmt, ...)
607
{
J
Joe Perches 已提交
608
	struct va_format vaf;
609 610
	va_list args;

611 612 613
	if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
		return;

614
	va_start(args, fmt);
J
Joe Perches 已提交
615 616 617
	vaf.fmt = fmt;
	vaf.va = &args;
	printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
618 619 620
	va_end(args);
}

621
void __ext4_warning(struct super_block *sb, const char *function,
622
		    unsigned int line, const char *fmt, ...)
623
{
J
Joe Perches 已提交
624
	struct va_format vaf;
625 626
	va_list args;

627 628 629 630
	if (!___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state),
			  "EXT4-fs warning"))
		return;

631
	va_start(args, fmt);
J
Joe Perches 已提交
632 633 634 635
	vaf.fmt = fmt;
	vaf.va = &args;
	printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
	       sb->s_id, function, line, &vaf);
636 637 638
	va_end(args);
}

639 640 641 642
void __ext4_grp_locked_error(const char *function, unsigned int line,
			     struct super_block *sb, ext4_group_t grp,
			     unsigned long ino, ext4_fsblk_t block,
			     const char *fmt, ...)
643 644 645
__releases(bitlock)
__acquires(bitlock)
{
J
Joe Perches 已提交
646
	struct va_format vaf;
647 648 649
	va_list args;
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;

650 651 652
	es->s_last_error_ino = cpu_to_le32(ino);
	es->s_last_error_block = cpu_to_le64(block);
	__save_error_info(sb, function, line);
J
Joe Perches 已提交
653

654 655 656 657 658 659 660 661 662 663 664 665 666 667
	if (ext4_error_ratelimit(sb)) {
		va_start(args, fmt);
		vaf.fmt = fmt;
		vaf.va = &args;
		printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
		       sb->s_id, function, line, grp);
		if (ino)
			printk(KERN_CONT "inode %lu: ", ino);
		if (block)
			printk(KERN_CONT "block %llu:",
			       (unsigned long long) block);
		printk(KERN_CONT "%pV\n", &vaf);
		va_end(args);
	}
668 669

	if (test_opt(sb, ERRORS_CONT)) {
670
		ext4_commit_super(sb, 0);
671 672
		return;
	}
673

674 675 676 677 678 679 680 681
	ext4_unlock_group(sb, grp);
	ext4_handle_error(sb);
	/*
	 * We only get here in the ERRORS_RO case; relocking the group
	 * may be dangerous, but nothing bad will happen since the
	 * filesystem will have already been marked read/only and the
	 * journal has been aborted.  We return 1 as a hint to callers
	 * who might what to use the return value from
L
Lucas De Marchi 已提交
682
	 * ext4_grp_locked_error() to distinguish between the
683 684 685 686 687 688 689 690
	 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
	 * aggressively from the ext4 function in question, with a
	 * more appropriate error code.
	 */
	ext4_lock_group(sb, grp);
	return;
}

691
void ext4_update_dynamic_rev(struct super_block *sb)
692
{
693
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;
694

695
	if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
696 697
		return;

698
	ext4_warning(sb,
699 700
		     "updating to rev %d because of new feature flag, "
		     "running e2fsck is recommended",
701
		     EXT4_DYNAMIC_REV);
702

703 704 705
	es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
	es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
	es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
706 707 708 709 710 711 712 713 714 715 716 717 718
	/* leave es->s_feature_*compat flags alone */
	/* es->s_uuid will be set by e2fsck if empty */

	/*
	 * The rest of the superblock fields should be zero, and if not it
	 * means they are likely already in use, so leave them alone.  We
	 * can leave it up to e2fsck to clean up any inconsistencies there.
	 */
}

/*
 * Open the external journal device
 */
719
static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
720 721 722 723
{
	struct block_device *bdev;
	char b[BDEVNAME_SIZE];

724
	bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
725 726 727 728 729
	if (IS_ERR(bdev))
		goto fail;
	return bdev;

fail:
730
	ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
731 732 733 734 735 736 737
			__bdevname(dev, b), PTR_ERR(bdev));
	return NULL;
}

/*
 * Release the journal device
 */
A
Al Viro 已提交
738
static void ext4_blkdev_put(struct block_device *bdev)
739
{
A
Al Viro 已提交
740
	blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
741 742
}

A
Al Viro 已提交
743
static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
744 745 746 747
{
	struct block_device *bdev;
	bdev = sbi->journal_bdev;
	if (bdev) {
A
Al Viro 已提交
748
		ext4_blkdev_put(bdev);
749 750 751 752 753 754
		sbi->journal_bdev = NULL;
	}
}

static inline struct inode *orphan_list_entry(struct list_head *l)
{
755
	return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
756 757
}

758
static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
759 760 761
{
	struct list_head *l;

762 763
	ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
		 le32_to_cpu(sbi->s_es->s_last_orphan));
764 765 766 767 768 769 770 771 772 773 774 775

	printk(KERN_ERR "sb_info orphan list:\n");
	list_for_each(l, &sbi->s_orphan) {
		struct inode *inode = orphan_list_entry(l);
		printk(KERN_ERR "  "
		       "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
		       inode->i_sb->s_id, inode->i_ino, inode,
		       inode->i_mode, inode->i_nlink,
		       NEXT_ORPHAN(inode));
	}
}

776
static void ext4_put_super(struct super_block *sb)
777
{
778 779
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
780
	int i, err;
781

782
	ext4_unregister_li_request(sb);
783 784
	dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);

785 786
	flush_workqueue(sbi->rsv_conversion_wq);
	destroy_workqueue(sbi->rsv_conversion_wq);
787

788 789 790 791
	if (sbi->s_journal) {
		err = jbd2_journal_destroy(sbi->s_journal);
		sbi->s_journal = NULL;
		if (err < 0)
792
			ext4_abort(sb, "Couldn't clean up the journal");
793
	}
794

795
	ext4_es_unregister_shrinker(sbi);
796
	del_timer_sync(&sbi->s_err_report);
797 798 799 800 801
	ext4_release_system_zone(sb);
	ext4_mb_release(sb);
	ext4_ext_release(sb);
	ext4_xattr_put_super(sb);

802
	if (!(sb->s_flags & MS_RDONLY)) {
803
		EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
804 805
		es->s_state = cpu_to_le16(sbi->s_mount_state);
	}
806
	if (!(sb->s_flags & MS_RDONLY))
807 808
		ext4_commit_super(sb, 1);

809
	if (sbi->s_proc) {
810
		remove_proc_entry("options", sbi->s_proc);
811
		remove_proc_entry(sb->s_id, ext4_proc_root);
812
	}
T
Theodore Ts'o 已提交
813
	kobject_del(&sbi->s_kobj);
814 815 816

	for (i = 0; i < sbi->s_gdb_count; i++)
		brelse(sbi->s_group_desc[i]);
817
	ext4_kvfree(sbi->s_group_desc);
818
	ext4_kvfree(sbi->s_flex_groups);
819
	percpu_counter_destroy(&sbi->s_freeclusters_counter);
820 821
	percpu_counter_destroy(&sbi->s_freeinodes_counter);
	percpu_counter_destroy(&sbi->s_dirs_counter);
822
	percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
823
	percpu_counter_destroy(&sbi->s_extent_cache_cnt);
824 825 826 827 828 829 830 831 832 833 834 835 836 837
	brelse(sbi->s_sbh);
#ifdef CONFIG_QUOTA
	for (i = 0; i < MAXQUOTAS; i++)
		kfree(sbi->s_qf_names[i]);
#endif

	/* Debugging code just in case the in-memory inode orphan list
	 * isn't empty.  The on-disk one can be non-empty if we've
	 * detected an error and taken the fs readonly, but the
	 * in-memory list had better be clean by this point. */
	if (!list_empty(&sbi->s_orphan))
		dump_orphan_list(sb, sbi);
	J_ASSERT(list_empty(&sbi->s_orphan));

838
	invalidate_bdev(sb->s_bdev);
839 840 841 842 843 844 845
	if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
		/*
		 * Invalidate the journal device's buffers.  We don't want them
		 * floating about in memory - the physical journal device may
		 * hotswapped, and it breaks the `ro-after' testing code.
		 */
		sync_blockdev(sbi->journal_bdev);
846
		invalidate_bdev(sbi->journal_bdev);
847
		ext4_blkdev_remove(sbi);
848
	}
849 850 851 852
	if (sbi->s_mb_cache) {
		ext4_xattr_destroy_cache(sbi->s_mb_cache);
		sbi->s_mb_cache = NULL;
	}
853 854
	if (sbi->s_mmp_tsk)
		kthread_stop(sbi->s_mmp_tsk);
855
	sb->s_fs_info = NULL;
T
Theodore Ts'o 已提交
856 857 858 859 860 861
	/*
	 * Now that we are completely done shutting down the
	 * superblock, we need to actually destroy the kobject.
	 */
	kobject_put(&sbi->s_kobj);
	wait_for_completion(&sbi->s_kobj_unregister);
862 863
	if (sbi->s_chksum_driver)
		crypto_free_shash(sbi->s_chksum_driver);
864
	kfree(sbi->s_blockgroup_lock);
865 866 867
	kfree(sbi);
}

868
static struct kmem_cache *ext4_inode_cachep;
869 870 871 872

/*
 * Called inside transaction, so use GFP_NOFS
 */
873
static struct inode *ext4_alloc_inode(struct super_block *sb)
874
{
875
	struct ext4_inode_info *ei;
876

C
Christoph Lameter 已提交
877
	ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
878 879
	if (!ei)
		return NULL;
880

881
	ei->vfs_inode.i_version = 1;
882
	spin_lock_init(&ei->i_raw_lock);
883 884
	INIT_LIST_HEAD(&ei->i_prealloc_list);
	spin_lock_init(&ei->i_prealloc_lock);
Z
Zheng Liu 已提交
885 886
	ext4_es_init_tree(&ei->i_es_tree);
	rwlock_init(&ei->i_es_lock);
887 888
	INIT_LIST_HEAD(&ei->i_es_lru);
	ei->i_es_lru_nr = 0;
889
	ei->i_touch_when = 0;
890 891 892
	ei->i_reserved_data_blocks = 0;
	ei->i_reserved_meta_blocks = 0;
	ei->i_allocated_meta_blocks = 0;
893
	ei->i_da_metadata_calc_len = 0;
894
	ei->i_da_metadata_calc_last_lblock = 0;
895
	spin_lock_init(&(ei->i_block_reservation_lock));
896 897 898
#ifdef CONFIG_QUOTA
	ei->i_reserved_quota = 0;
#endif
899
	ei->jinode = NULL;
900
	INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
901
	spin_lock_init(&ei->i_completed_io_lock);
902 903
	ei->i_sync_tid = 0;
	ei->i_datasync_tid = 0;
904
	atomic_set(&ei->i_ioend_count, 0);
905
	atomic_set(&ei->i_unwritten, 0);
906
	INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
907

908 909 910
	return &ei->vfs_inode;
}

911 912 913 914 915 916 917 918
static int ext4_drop_inode(struct inode *inode)
{
	int drop = generic_drop_inode(inode);

	trace_ext4_drop_inode(inode, drop);
	return drop;
}

N
Nick Piggin 已提交
919 920 921 922 923 924
static void ext4_i_callback(struct rcu_head *head)
{
	struct inode *inode = container_of(head, struct inode, i_rcu);
	kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
}

925
static void ext4_destroy_inode(struct inode *inode)
926
{
927
	if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
928 929 930
		ext4_msg(inode->i_sb, KERN_ERR,
			 "Inode %lu (%p): orphan list check failed!",
			 inode->i_ino, EXT4_I(inode));
931 932 933 934 935
		print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
				EXT4_I(inode), sizeof(struct ext4_inode_info),
				true);
		dump_stack();
	}
N
Nick Piggin 已提交
936
	call_rcu(&inode->i_rcu, ext4_i_callback);
937 938
}

939
static void init_once(void *foo)
940
{
941
	struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
942

C
Christoph Lameter 已提交
943 944
	INIT_LIST_HEAD(&ei->i_orphan);
	init_rwsem(&ei->xattr_sem);
945
	init_rwsem(&ei->i_data_sem);
C
Christoph Lameter 已提交
946
	inode_init_once(&ei->vfs_inode);
947 948
}

949
static int __init init_inodecache(void)
950
{
951 952
	ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
					     sizeof(struct ext4_inode_info),
953 954
					     0, (SLAB_RECLAIM_ACCOUNT|
						SLAB_MEM_SPREAD),
955
					     init_once);
956
	if (ext4_inode_cachep == NULL)
957 958 959 960 961 962
		return -ENOMEM;
	return 0;
}

static void destroy_inodecache(void)
{
963 964 965 966 967
	/*
	 * Make sure all delayed rcu free inodes are flushed before we
	 * destroy cache.
	 */
	rcu_barrier();
968
	kmem_cache_destroy(ext4_inode_cachep);
969 970
}

A
Al Viro 已提交
971
void ext4_clear_inode(struct inode *inode)
972
{
A
Al Viro 已提交
973
	invalidate_inode_buffers(inode);
974
	clear_inode(inode);
975
	dquot_drop(inode);
976
	ext4_discard_preallocations(inode);
977
	ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
978
	ext4_es_lru_del(inode);
979 980 981 982 983 984
	if (EXT4_I(inode)->jinode) {
		jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
					       EXT4_I(inode)->jinode);
		jbd2_free_inode(EXT4_I(inode)->jinode);
		EXT4_I(inode)->jinode = NULL;
	}
985 986
}

C
Christoph Hellwig 已提交
987
static struct inode *ext4_nfs_get_inode(struct super_block *sb,
988
					u64 ino, u32 generation)
989 990 991
{
	struct inode *inode;

992
	if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
993
		return ERR_PTR(-ESTALE);
994
	if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
995 996 997 998
		return ERR_PTR(-ESTALE);

	/* iget isn't really right if the inode is currently unallocated!!
	 *
999
	 * ext4_read_inode will return a bad_inode if the inode had been
1000 1001 1002 1003 1004
	 * deleted, so we should be safe.
	 *
	 * Currently we don't know the generation for parent directory, so
	 * a generation of 0 means "accept any"
	 */
1005 1006 1007 1008
	inode = ext4_iget(sb, ino);
	if (IS_ERR(inode))
		return ERR_CAST(inode);
	if (generation && inode->i_generation != generation) {
1009 1010 1011
		iput(inode);
		return ERR_PTR(-ESTALE);
	}
C
Christoph Hellwig 已提交
1012 1013 1014 1015 1016

	return inode;
}

static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1017
					int fh_len, int fh_type)
C
Christoph Hellwig 已提交
1018 1019 1020 1021 1022 1023
{
	return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
				    ext4_nfs_get_inode);
}

static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
1024
					int fh_len, int fh_type)
C
Christoph Hellwig 已提交
1025 1026 1027
{
	return generic_fh_to_parent(sb, fid, fh_len, fh_type,
				    ext4_nfs_get_inode);
1028 1029
}

1030 1031 1032 1033 1034 1035
/*
 * Try to release metadata pages (indirect blocks, directories) which are
 * mapped via the block device.  Since these pages could have journal heads
 * which would prevent try_to_free_buffers() from freeing them, we must use
 * jbd2 layer's try_to_free_buffers() function to release them.
 */
1036 1037
static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
				 gfp_t wait)
1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049
{
	journal_t *journal = EXT4_SB(sb)->s_journal;

	WARN_ON(PageChecked(page));
	if (!page_has_buffers(page))
		return 0;
	if (journal)
		return jbd2_journal_try_to_free_buffers(journal, page,
							wait & ~__GFP_WAIT);
	return try_to_free_buffers(page);
}

1050
#ifdef CONFIG_QUOTA
1051
#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1052
#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1053

1054 1055 1056 1057 1058
static int ext4_write_dquot(struct dquot *dquot);
static int ext4_acquire_dquot(struct dquot *dquot);
static int ext4_release_dquot(struct dquot *dquot);
static int ext4_mark_dquot_dirty(struct dquot *dquot);
static int ext4_write_info(struct super_block *sb, int type);
1059
static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1060
			 struct path *path);
1061 1062
static int ext4_quota_on_sysfile(struct super_block *sb, int type,
				 int format_id);
1063
static int ext4_quota_off(struct super_block *sb, int type);
1064
static int ext4_quota_off_sysfile(struct super_block *sb, int type);
1065 1066
static int ext4_quota_on_mount(struct super_block *sb, int type);
static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
1067
			       size_t len, loff_t off);
1068
static ssize_t ext4_quota_write(struct super_block *sb, int type,
1069
				const char *data, size_t len, loff_t off);
1070 1071 1072
static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
			     unsigned int flags);
static int ext4_enable_quotas(struct super_block *sb);
1073

1074
static const struct dquot_operations ext4_quota_operations = {
1075
	.get_reserved_space = ext4_get_reserved_space,
1076 1077 1078 1079
	.write_dquot	= ext4_write_dquot,
	.acquire_dquot	= ext4_acquire_dquot,
	.release_dquot	= ext4_release_dquot,
	.mark_dirty	= ext4_mark_dquot_dirty,
1080 1081 1082
	.write_info	= ext4_write_info,
	.alloc_dquot	= dquot_alloc,
	.destroy_dquot	= dquot_destroy,
1083 1084
};

1085
static const struct quotactl_ops ext4_qctl_operations = {
1086
	.quota_on	= ext4_quota_on,
1087
	.quota_off	= ext4_quota_off,
1088 1089 1090 1091 1092
	.quota_sync	= dquot_quota_sync,
	.get_info	= dquot_get_dqinfo,
	.set_info	= dquot_set_dqinfo,
	.get_dqblk	= dquot_get_dqblk,
	.set_dqblk	= dquot_set_dqblk
1093
};
1094 1095 1096 1097 1098 1099 1100 1101 1102 1103

static const struct quotactl_ops ext4_qctl_sysfile_operations = {
	.quota_on_meta	= ext4_quota_on_sysfile,
	.quota_off	= ext4_quota_off_sysfile,
	.quota_sync	= dquot_quota_sync,
	.get_info	= dquot_get_dqinfo,
	.set_info	= dquot_set_dqinfo,
	.get_dqblk	= dquot_get_dqblk,
	.set_dqblk	= dquot_set_dqblk
};
1104 1105
#endif

1106
static const struct super_operations ext4_sops = {
1107 1108 1109 1110
	.alloc_inode	= ext4_alloc_inode,
	.destroy_inode	= ext4_destroy_inode,
	.write_inode	= ext4_write_inode,
	.dirty_inode	= ext4_dirty_inode,
1111
	.drop_inode	= ext4_drop_inode,
A
Al Viro 已提交
1112
	.evict_inode	= ext4_evict_inode,
1113 1114
	.put_super	= ext4_put_super,
	.sync_fs	= ext4_sync_fs,
1115 1116
	.freeze_fs	= ext4_freeze,
	.unfreeze_fs	= ext4_unfreeze,
1117 1118 1119
	.statfs		= ext4_statfs,
	.remount_fs	= ext4_remount,
	.show_options	= ext4_show_options,
1120
#ifdef CONFIG_QUOTA
1121 1122
	.quota_read	= ext4_quota_read,
	.quota_write	= ext4_quota_write,
1123
#endif
1124
	.bdev_try_to_free_page = bdev_try_to_free_page,
1125 1126
};

1127 1128 1129 1130 1131
static const struct super_operations ext4_nojournal_sops = {
	.alloc_inode	= ext4_alloc_inode,
	.destroy_inode	= ext4_destroy_inode,
	.write_inode	= ext4_write_inode,
	.dirty_inode	= ext4_dirty_inode,
1132
	.drop_inode	= ext4_drop_inode,
A
Al Viro 已提交
1133
	.evict_inode	= ext4_evict_inode,
1134
	.sync_fs	= ext4_sync_fs_nojournal,
1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145
	.put_super	= ext4_put_super,
	.statfs		= ext4_statfs,
	.remount_fs	= ext4_remount,
	.show_options	= ext4_show_options,
#ifdef CONFIG_QUOTA
	.quota_read	= ext4_quota_read,
	.quota_write	= ext4_quota_write,
#endif
	.bdev_try_to_free_page = bdev_try_to_free_page,
};

1146
static const struct export_operations ext4_export_ops = {
C
Christoph Hellwig 已提交
1147 1148
	.fh_to_dentry = ext4_fh_to_dentry,
	.fh_to_parent = ext4_fh_to_parent,
1149
	.get_parent = ext4_get_parent,
1150 1151 1152 1153 1154
};

enum {
	Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
	Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
1155
	Opt_nouid32, Opt_debug, Opt_removed,
1156
	Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1157
	Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
1158 1159
	Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
	Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
1160
	Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1161
	Opt_data_err_abort, Opt_data_err_ignore,
1162
	Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
J
Jan Kara 已提交
1163
	Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
T
Theodore Ts'o 已提交
1164
	Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
1165
	Opt_usrquota, Opt_grpquota, Opt_i_version,
1166 1167
	Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
	Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
1168
	Opt_inode_readahead_blks, Opt_journal_ioprio,
1169
	Opt_dioread_nolock, Opt_dioread_lock,
1170
	Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
1171
	Opt_max_dir_size_kb,
1172 1173
};

1174
static const match_table_t tokens = {
1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188
	{Opt_bsd_df, "bsddf"},
	{Opt_minix_df, "minixdf"},
	{Opt_grpid, "grpid"},
	{Opt_grpid, "bsdgroups"},
	{Opt_nogrpid, "nogrpid"},
	{Opt_nogrpid, "sysvgroups"},
	{Opt_resgid, "resgid=%u"},
	{Opt_resuid, "resuid=%u"},
	{Opt_sb, "sb=%u"},
	{Opt_err_cont, "errors=continue"},
	{Opt_err_panic, "errors=panic"},
	{Opt_err_ro, "errors=remount-ro"},
	{Opt_nouid32, "nouid32"},
	{Opt_debug, "debug"},
1189 1190
	{Opt_removed, "oldalloc"},
	{Opt_removed, "orlov"},
1191 1192 1193 1194
	{Opt_user_xattr, "user_xattr"},
	{Opt_nouser_xattr, "nouser_xattr"},
	{Opt_acl, "acl"},
	{Opt_noacl, "noacl"},
1195
	{Opt_noload, "norecovery"},
1196
	{Opt_noload, "noload"},
1197 1198
	{Opt_removed, "nobh"},
	{Opt_removed, "bh"},
1199
	{Opt_commit, "commit=%u"},
1200 1201
	{Opt_min_batch_time, "min_batch_time=%u"},
	{Opt_max_batch_time, "max_batch_time=%u"},
1202
	{Opt_journal_dev, "journal_dev=%u"},
1203
	{Opt_journal_path, "journal_path=%s"},
1204 1205
	{Opt_journal_checksum, "journal_checksum"},
	{Opt_journal_async_commit, "journal_async_commit"},
1206 1207 1208 1209
	{Opt_abort, "abort"},
	{Opt_data_journal, "data=journal"},
	{Opt_data_ordered, "data=ordered"},
	{Opt_data_writeback, "data=writeback"},
1210 1211
	{Opt_data_err_abort, "data_err=abort"},
	{Opt_data_err_ignore, "data_err=ignore"},
1212 1213 1214 1215 1216 1217
	{Opt_offusrjquota, "usrjquota="},
	{Opt_usrjquota, "usrjquota=%s"},
	{Opt_offgrpjquota, "grpjquota="},
	{Opt_grpjquota, "grpjquota=%s"},
	{Opt_jqfmt_vfsold, "jqfmt=vfsold"},
	{Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
J
Jan Kara 已提交
1218
	{Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1219 1220 1221 1222 1223
	{Opt_grpquota, "grpquota"},
	{Opt_noquota, "noquota"},
	{Opt_quota, "quota"},
	{Opt_usrquota, "usrquota"},
	{Opt_barrier, "barrier=%u"},
T
Theodore Ts'o 已提交
1224 1225
	{Opt_barrier, "barrier"},
	{Opt_nobarrier, "nobarrier"},
1226
	{Opt_i_version, "i_version"},
1227
	{Opt_stripe, "stripe=%u"},
1228
	{Opt_delalloc, "delalloc"},
1229
	{Opt_nodelalloc, "nodelalloc"},
1230 1231
	{Opt_removed, "mblk_io_submit"},
	{Opt_removed, "nomblk_io_submit"},
1232 1233
	{Opt_block_validity, "block_validity"},
	{Opt_noblock_validity, "noblock_validity"},
1234
	{Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1235
	{Opt_journal_ioprio, "journal_ioprio=%u"},
1236
	{Opt_auto_da_alloc, "auto_da_alloc=%u"},
T
Theodore Ts'o 已提交
1237 1238
	{Opt_auto_da_alloc, "auto_da_alloc"},
	{Opt_noauto_da_alloc, "noauto_da_alloc"},
1239 1240
	{Opt_dioread_nolock, "dioread_nolock"},
	{Opt_dioread_lock, "dioread_lock"},
1241 1242
	{Opt_discard, "discard"},
	{Opt_nodiscard, "nodiscard"},
1243 1244 1245
	{Opt_init_itable, "init_itable=%u"},
	{Opt_init_itable, "init_itable"},
	{Opt_noinit_itable, "noinit_itable"},
1246
	{Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
1247 1248 1249 1250 1251
	{Opt_removed, "check=none"},	/* mount option from ext2/3 */
	{Opt_removed, "nocheck"},	/* mount option from ext2/3 */
	{Opt_removed, "reservation"},	/* mount option from ext2/3 */
	{Opt_removed, "noreservation"}, /* mount option from ext2/3 */
	{Opt_removed, "journal=%u"},	/* mount option from ext2/3 */
J
Josef Bacik 已提交
1252
	{Opt_err, NULL},
1253 1254
};

1255
static ext4_fsblk_t get_sb_block(void **data)
1256
{
1257
	ext4_fsblk_t	sb_block;
1258 1259 1260 1261
	char		*options = (char *) *data;

	if (!options || strncmp(options, "sb=", 3) != 0)
		return 1;	/* Default location */
1262

1263
	options += 3;
1264
	/* TODO: use simple_strtoll with >32bit ext4 */
1265 1266
	sb_block = simple_strtoul(options, &options, 0);
	if (*options && *options != ',') {
1267
		printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1268 1269 1270 1271 1272 1273
		       (char *) *data);
		return 1;
	}
	if (*options == ',')
		options++;
	*data = (void *) options;
1274

1275 1276 1277
	return sb_block;
}

1278
#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1279 1280
static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
	"Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1281

D
Dmitry Monakhov 已提交
1282 1283 1284 1285 1286
#ifdef CONFIG_QUOTA
static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	char *qname;
1287
	int ret = -1;
D
Dmitry Monakhov 已提交
1288 1289 1290 1291 1292 1293

	if (sb_any_quota_loaded(sb) &&
		!sbi->s_qf_names[qtype]) {
		ext4_msg(sb, KERN_ERR,
			"Cannot change journaled "
			"quota options when quota turned on");
1294
		return -1;
D
Dmitry Monakhov 已提交
1295
	}
1296 1297 1298 1299 1300
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) {
		ext4_msg(sb, KERN_ERR, "Cannot set journaled quota options "
			 "when QUOTA feature is enabled");
		return -1;
	}
D
Dmitry Monakhov 已提交
1301 1302 1303 1304
	qname = match_strdup(args);
	if (!qname) {
		ext4_msg(sb, KERN_ERR,
			"Not enough memory for storing quotafile name");
1305
		return -1;
D
Dmitry Monakhov 已提交
1306
	}
1307 1308 1309 1310 1311 1312 1313 1314
	if (sbi->s_qf_names[qtype]) {
		if (strcmp(sbi->s_qf_names[qtype], qname) == 0)
			ret = 1;
		else
			ext4_msg(sb, KERN_ERR,
				 "%s quota file already specified",
				 QTYPE2NAME(qtype));
		goto errout;
D
Dmitry Monakhov 已提交
1315
	}
1316
	if (strchr(qname, '/')) {
D
Dmitry Monakhov 已提交
1317 1318
		ext4_msg(sb, KERN_ERR,
			"quotafile must be on filesystem root");
1319
		goto errout;
D
Dmitry Monakhov 已提交
1320
	}
1321
	sbi->s_qf_names[qtype] = qname;
1322
	set_opt(sb, QUOTA);
D
Dmitry Monakhov 已提交
1323
	return 1;
1324 1325 1326
errout:
	kfree(qname);
	return ret;
D
Dmitry Monakhov 已提交
1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337
}

static int clear_qf_name(struct super_block *sb, int qtype)
{

	struct ext4_sb_info *sbi = EXT4_SB(sb);

	if (sb_any_quota_loaded(sb) &&
		sbi->s_qf_names[qtype]) {
		ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
			" when quota turned on");
1338
		return -1;
D
Dmitry Monakhov 已提交
1339
	}
1340
	kfree(sbi->s_qf_names[qtype]);
D
Dmitry Monakhov 已提交
1341 1342 1343 1344 1345
	sbi->s_qf_names[qtype] = NULL;
	return 1;
}
#endif

1346 1347 1348 1349 1350 1351
#define MOPT_SET	0x0001
#define MOPT_CLEAR	0x0002
#define MOPT_NOSUPPORT	0x0004
#define MOPT_EXPLICIT	0x0008
#define MOPT_CLEAR_ERR	0x0010
#define MOPT_GTE0	0x0020
1352
#ifdef CONFIG_QUOTA
1353 1354 1355 1356 1357
#define MOPT_Q		0
#define MOPT_QFMT	0x0040
#else
#define MOPT_Q		MOPT_NOSUPPORT
#define MOPT_QFMT	MOPT_NOSUPPORT
1358
#endif
1359
#define MOPT_DATAJ	0x0080
1360 1361 1362
#define MOPT_NO_EXT2	0x0100
#define MOPT_NO_EXT3	0x0200
#define MOPT_EXT4_ONLY	(MOPT_NO_EXT2 | MOPT_NO_EXT3)
1363
#define MOPT_STRING	0x0400
1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375

static const struct mount_opts {
	int	token;
	int	mount_opt;
	int	flags;
} ext4_mount_opts[] = {
	{Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
	{Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
	{Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
	{Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
	{Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
	{Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
1376 1377 1378 1379
	{Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
	 MOPT_EXT4_ONLY | MOPT_SET},
	{Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
	 MOPT_EXT4_ONLY | MOPT_CLEAR},
1380 1381
	{Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
	{Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1382 1383 1384
	{Opt_delalloc, EXT4_MOUNT_DELALLOC,
	 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
	{Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
1385
	 MOPT_EXT4_ONLY | MOPT_CLEAR},
1386 1387
	{Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
	 MOPT_EXT4_ONLY | MOPT_SET},
1388
	{Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1389 1390 1391
				    EXT4_MOUNT_JOURNAL_CHECKSUM),
	 MOPT_EXT4_ONLY | MOPT_SET},
	{Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
1392 1393 1394
	{Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
	{Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
	{Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
1395 1396 1397 1398
	{Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
	 MOPT_NO_EXT2 | MOPT_SET},
	{Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
	 MOPT_NO_EXT2 | MOPT_CLEAR},
1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409
	{Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
	{Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
	{Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
	{Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
	{Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
	{Opt_commit, 0, MOPT_GTE0},
	{Opt_max_batch_time, 0, MOPT_GTE0},
	{Opt_min_batch_time, 0, MOPT_GTE0},
	{Opt_inode_readahead_blks, 0, MOPT_GTE0},
	{Opt_init_itable, 0, MOPT_GTE0},
	{Opt_stripe, 0, MOPT_GTE0},
1410 1411 1412
	{Opt_resuid, 0, MOPT_GTE0},
	{Opt_resgid, 0, MOPT_GTE0},
	{Opt_journal_dev, 0, MOPT_GTE0},
1413
	{Opt_journal_path, 0, MOPT_STRING},
1414
	{Opt_journal_ioprio, 0, MOPT_GTE0},
1415 1416 1417 1418
	{Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
	{Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
	{Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
	 MOPT_NO_EXT2 | MOPT_DATAJ},
1419 1420
	{Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
	{Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
T
Theodore Ts'o 已提交
1421
#ifdef CONFIG_EXT4_FS_POSIX_ACL
1422 1423
	{Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
	{Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
1424
#else
1425 1426
	{Opt_acl, 0, MOPT_NOSUPPORT},
	{Opt_noacl, 0, MOPT_NOSUPPORT},
1427
#endif
1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443
	{Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
	{Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
	{Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
	{Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
							MOPT_SET | MOPT_Q},
	{Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
							MOPT_SET | MOPT_Q},
	{Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
		       EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
	{Opt_usrjquota, 0, MOPT_Q},
	{Opt_grpjquota, 0, MOPT_Q},
	{Opt_offusrjquota, 0, MOPT_Q},
	{Opt_offgrpjquota, 0, MOPT_Q},
	{Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
	{Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
	{Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
1444
	{Opt_max_dir_size_kb, 0, MOPT_GTE0},
1445 1446 1447 1448 1449 1450 1451 1452 1453
	{Opt_err, 0, 0}
};

static int handle_mount_opt(struct super_block *sb, char *opt, int token,
			    substring_t *args, unsigned long *journal_devnum,
			    unsigned int *journal_ioprio, int is_remount)
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	const struct mount_opts *m;
1454 1455
	kuid_t uid;
	kgid_t gid;
1456 1457
	int arg = 0;

1458 1459 1460 1461 1462 1463 1464 1465 1466 1467
#ifdef CONFIG_QUOTA
	if (token == Opt_usrjquota)
		return set_qf_name(sb, USRQUOTA, &args[0]);
	else if (token == Opt_grpjquota)
		return set_qf_name(sb, GRPQUOTA, &args[0]);
	else if (token == Opt_offusrjquota)
		return clear_qf_name(sb, USRQUOTA);
	else if (token == Opt_offgrpjquota)
		return clear_qf_name(sb, GRPQUOTA);
#endif
1468
	switch (token) {
1469 1470 1471 1472
	case Opt_noacl:
	case Opt_nouser_xattr:
		ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
		break;
1473 1474 1475
	case Opt_sb:
		return 1;	/* handled by get_sb_block() */
	case Opt_removed:
1476
		ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
1477 1478 1479 1480 1481 1482 1483 1484 1485
		return 1;
	case Opt_abort:
		sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
		return 1;
	case Opt_i_version:
		sb->s_flags |= MS_I_VERSION;
		return 1;
	}

1486 1487 1488 1489 1490 1491 1492 1493 1494 1495
	for (m = ext4_mount_opts; m->token != Opt_err; m++)
		if (token == m->token)
			break;

	if (m->token == Opt_err) {
		ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
			 "or missing value", opt);
		return -1;
	}

1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506
	if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
		ext4_msg(sb, KERN_ERR,
			 "Mount option \"%s\" incompatible with ext2", opt);
		return -1;
	}
	if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
		ext4_msg(sb, KERN_ERR,
			 "Mount option \"%s\" incompatible with ext3", opt);
		return -1;
	}

1507
	if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533
		return -1;
	if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
		return -1;
	if (m->flags & MOPT_EXPLICIT)
		set_opt2(sb, EXPLICIT_DELALLOC);
	if (m->flags & MOPT_CLEAR_ERR)
		clear_opt(sb, ERRORS_MASK);
	if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
		ext4_msg(sb, KERN_ERR, "Cannot change quota "
			 "options when quota turned on");
		return -1;
	}

	if (m->flags & MOPT_NOSUPPORT) {
		ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
	} else if (token == Opt_commit) {
		if (arg == 0)
			arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
		sbi->s_commit_interval = HZ * arg;
	} else if (token == Opt_max_batch_time) {
		if (arg == 0)
			arg = EXT4_DEF_MAX_BATCH_TIME;
		sbi->s_max_batch_time = arg;
	} else if (token == Opt_min_batch_time) {
		sbi->s_min_batch_time = arg;
	} else if (token == Opt_inode_readahead_blks) {
1534 1535 1536 1537
		if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
			ext4_msg(sb, KERN_ERR,
				 "EXT4-fs: inode_readahead_blks must be "
				 "0 or a power of 2 smaller than 2^31");
1538
			return -1;
1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553
		}
		sbi->s_inode_readahead_blks = arg;
	} else if (token == Opt_init_itable) {
		set_opt(sb, INIT_INODE_TABLE);
		if (!args->from)
			arg = EXT4_DEF_LI_WAIT_MULT;
		sbi->s_li_wait_mult = arg;
	} else if (token == Opt_max_dir_size_kb) {
		sbi->s_max_dir_size_kb = arg;
	} else if (token == Opt_stripe) {
		sbi->s_stripe = arg;
	} else if (token == Opt_resuid) {
		uid = make_kuid(current_user_ns(), arg);
		if (!uid_valid(uid)) {
			ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
1554 1555
			return -1;
		}
1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570
		sbi->s_resuid = uid;
	} else if (token == Opt_resgid) {
		gid = make_kgid(current_user_ns(), arg);
		if (!gid_valid(gid)) {
			ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
			return -1;
		}
		sbi->s_resgid = gid;
	} else if (token == Opt_journal_dev) {
		if (is_remount) {
			ext4_msg(sb, KERN_ERR,
				 "Cannot specify journal on remount");
			return -1;
		}
		*journal_devnum = arg;
1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608
	} else if (token == Opt_journal_path) {
		char *journal_path;
		struct inode *journal_inode;
		struct path path;
		int error;

		if (is_remount) {
			ext4_msg(sb, KERN_ERR,
				 "Cannot specify journal on remount");
			return -1;
		}
		journal_path = match_strdup(&args[0]);
		if (!journal_path) {
			ext4_msg(sb, KERN_ERR, "error: could not dup "
				"journal device string");
			return -1;
		}

		error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
		if (error) {
			ext4_msg(sb, KERN_ERR, "error: could not find "
				"journal device path: error %d", error);
			kfree(journal_path);
			return -1;
		}

		journal_inode = path.dentry->d_inode;
		if (!S_ISBLK(journal_inode->i_mode)) {
			ext4_msg(sb, KERN_ERR, "error: journal path %s "
				"is not a block device", journal_path);
			path_put(&path);
			kfree(journal_path);
			return -1;
		}

		*journal_devnum = new_encode_dev(journal_inode->i_rdev);
		path_put(&path);
		kfree(journal_path);
1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621
	} else if (token == Opt_journal_ioprio) {
		if (arg > 7) {
			ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
				 " (must be 0-7)");
			return -1;
		}
		*journal_ioprio =
			IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
	} else if (m->flags & MOPT_DATAJ) {
		if (is_remount) {
			if (!sbi->s_journal)
				ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
			else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
1622
				ext4_msg(sb, KERN_ERR,
1623 1624
					 "Cannot change data mode on remount");
				return -1;
1625
			}
1626
		} else {
1627 1628
			clear_opt(sb, DATA_FLAGS);
			sbi->s_mount_opt |= m->mount_opt;
1629
		}
1630 1631 1632 1633 1634 1635 1636 1637
#ifdef CONFIG_QUOTA
	} else if (m->flags & MOPT_QFMT) {
		if (sb_any_quota_loaded(sb) &&
		    sbi->s_jquota_fmt != m->mount_opt) {
			ext4_msg(sb, KERN_ERR, "Cannot change journaled "
				 "quota options when quota turned on");
			return -1;
		}
1638 1639 1640 1641 1642 1643 1644
		if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
					       EXT4_FEATURE_RO_COMPAT_QUOTA)) {
			ext4_msg(sb, KERN_ERR,
				 "Cannot set journaled quota options "
				 "when QUOTA feature is enabled");
			return -1;
		}
1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661
		sbi->s_jquota_fmt = m->mount_opt;
#endif
	} else {
		if (!args->from)
			arg = 1;
		if (m->flags & MOPT_CLEAR)
			arg = !arg;
		else if (unlikely(!(m->flags & MOPT_SET))) {
			ext4_msg(sb, KERN_WARNING,
				 "buggy handling of option %s", opt);
			WARN_ON(1);
			return -1;
		}
		if (arg != 0)
			sbi->s_mount_opt |= m->mount_opt;
		else
			sbi->s_mount_opt &= ~m->mount_opt;
1662
	}
1663
	return 1;
1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685
}

static int parse_options(char *options, struct super_block *sb,
			 unsigned long *journal_devnum,
			 unsigned int *journal_ioprio,
			 int is_remount)
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	char *p;
	substring_t args[MAX_OPT_ARGS];
	int token;

	if (!options)
		return 1;

	while ((p = strsep(&options, ",")) != NULL) {
		if (!*p)
			continue;
		/*
		 * Initialize args struct so we know whether arg was
		 * found; some options take optional arguments.
		 */
1686
		args[0].to = args[0].from = NULL;
1687 1688 1689 1690
		token = match_token(p, tokens, args);
		if (handle_mount_opt(sb, p, token, args, journal_devnum,
				     journal_ioprio, is_remount) < 0)
			return 0;
1691 1692
	}
#ifdef CONFIG_QUOTA
1693 1694 1695 1696 1697 1698
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
	    (test_opt(sb, USRQUOTA) || test_opt(sb, GRPQUOTA))) {
		ext4_msg(sb, KERN_ERR, "Cannot set quota options when QUOTA "
			 "feature is enabled");
		return 0;
	}
1699
	if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1700
		if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1701
			clear_opt(sb, USRQUOTA);
1702

1703
		if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1704
			clear_opt(sb, GRPQUOTA);
1705

D
Dmitry Monakhov 已提交
1706
		if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1707 1708
			ext4_msg(sb, KERN_ERR, "old and new quota "
					"format mixing");
1709 1710 1711 1712
			return 0;
		}

		if (!sbi->s_jquota_fmt) {
1713 1714
			ext4_msg(sb, KERN_ERR, "journaled quota format "
					"not specified");
1715 1716 1717 1718
			return 0;
		}
	} else {
		if (sbi->s_jquota_fmt) {
1719
			ext4_msg(sb, KERN_ERR, "journaled quota format "
1720
					"specified with no journaling "
1721
					"enabled");
1722 1723 1724 1725
			return 0;
		}
	}
#endif
J
Jan Kara 已提交
1726 1727 1728 1729 1730 1731 1732 1733 1734 1735
	if (test_opt(sb, DIOREAD_NOLOCK)) {
		int blocksize =
			BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);

		if (blocksize < PAGE_CACHE_SIZE) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
				 "dioread_nolock if block size != PAGE_SIZE");
			return 0;
		}
	}
1736 1737 1738
	return 1;
}

1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769
static inline void ext4_show_quota_options(struct seq_file *seq,
					   struct super_block *sb)
{
#if defined(CONFIG_QUOTA)
	struct ext4_sb_info *sbi = EXT4_SB(sb);

	if (sbi->s_jquota_fmt) {
		char *fmtname = "";

		switch (sbi->s_jquota_fmt) {
		case QFMT_VFS_OLD:
			fmtname = "vfsold";
			break;
		case QFMT_VFS_V0:
			fmtname = "vfsv0";
			break;
		case QFMT_VFS_V1:
			fmtname = "vfsv1";
			break;
		}
		seq_printf(seq, ",jqfmt=%s", fmtname);
	}

	if (sbi->s_qf_names[USRQUOTA])
		seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);

	if (sbi->s_qf_names[GRPQUOTA])
		seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
#endif
}

1770 1771
static const char *token2str(int token)
{
1772
	const struct match_token *t;
1773 1774 1775 1776 1777 1778 1779

	for (t = tokens; t->token != Opt_err; t++)
		if (t->token == token && !strchr(t->pattern, '='))
			break;
	return t->pattern;
}

1780 1781 1782 1783 1784
/*
 * Show an option if
 *  - it's set to a non-default value OR
 *  - if the per-sb default is different from the global default
 */
1785 1786
static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
			      int nodefs)
1787 1788 1789
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
1790
	int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
1791
	const struct mount_opts *m;
1792
	char sep = nodefs ? '\n' : ',';
1793

1794 1795
#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
1796 1797

	if (sbi->s_sb_block != 1)
1798 1799 1800 1801 1802 1803 1804
		SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);

	for (m = ext4_mount_opts; m->token != Opt_err; m++) {
		int want_set = m->flags & MOPT_SET;
		if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
		    (m->flags & MOPT_CLEAR_ERR))
			continue;
1805
		if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
1806 1807 1808 1809 1810 1811
			continue; /* skip if same as the default */
		if ((want_set &&
		     (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
		    (!want_set && (sbi->s_mount_opt & m->mount_opt)))
			continue; /* select Opt_noFoo vs Opt_Foo */
		SEQ_OPTS_PRINT("%s", token2str(m->token));
1812
	}
1813

1814
	if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
1815
	    le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
1816 1817 1818
		SEQ_OPTS_PRINT("resuid=%u",
				from_kuid_munged(&init_user_ns, sbi->s_resuid));
	if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
1819
	    le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
1820 1821
		SEQ_OPTS_PRINT("resgid=%u",
				from_kgid_munged(&init_user_ns, sbi->s_resgid));
1822
	def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
1823 1824
	if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
		SEQ_OPTS_PUTS("errors=remount-ro");
1825
	if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
1826
		SEQ_OPTS_PUTS("errors=continue");
1827
	if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
1828
		SEQ_OPTS_PUTS("errors=panic");
1829
	if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
1830
		SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
1831
	if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
1832
		SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
1833
	if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
1834
		SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
1835
	if (sb->s_flags & MS_I_VERSION)
1836
		SEQ_OPTS_PUTS("i_version");
1837
	if (nodefs || sbi->s_stripe)
1838
		SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
1839
	if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
1840 1841 1842 1843 1844 1845 1846
		if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
			SEQ_OPTS_PUTS("data=journal");
		else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
			SEQ_OPTS_PUTS("data=ordered");
		else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
			SEQ_OPTS_PUTS("data=writeback");
	}
1847 1848
	if (nodefs ||
	    sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
1849 1850
		SEQ_OPTS_PRINT("inode_readahead_blks=%u",
			       sbi->s_inode_readahead_blks);
1851

1852 1853
	if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
		       (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
1854
		SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
1855 1856
	if (nodefs || sbi->s_max_dir_size_kb)
		SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
1857 1858 1859 1860 1861

	ext4_show_quota_options(seq, sb);
	return 0;
}

1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879
static int ext4_show_options(struct seq_file *seq, struct dentry *root)
{
	return _ext4_show_options(seq, root->d_sb, 0);
}

static int options_seq_show(struct seq_file *seq, void *offset)
{
	struct super_block *sb = seq->private;
	int rc;

	seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
	rc = _ext4_show_options(seq, sb, 1);
	seq_puts(seq, "\n");
	return rc;
}

static int options_open_fs(struct inode *inode, struct file *file)
{
A
Al Viro 已提交
1880
	return single_open(file, options_seq_show, PDE_DATA(inode));
1881 1882 1883 1884 1885 1886 1887 1888 1889 1890
}

static const struct file_operations ext4_seq_options_fops = {
	.owner = THIS_MODULE,
	.open = options_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

1891
static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1892 1893
			    int read_only)
{
1894
	struct ext4_sb_info *sbi = EXT4_SB(sb);
1895 1896
	int res = 0;

1897
	if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1898 1899
		ext4_msg(sb, KERN_ERR, "revision level too high, "
			 "forcing read-only mode");
1900 1901 1902
		res = MS_RDONLY;
	}
	if (read_only)
1903
		goto done;
1904
	if (!(sbi->s_mount_state & EXT4_VALID_FS))
1905 1906
		ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
			 "running e2fsck is recommended");
1907
	else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1908 1909 1910
		ext4_msg(sb, KERN_WARNING,
			 "warning: mounting fs with errors, "
			 "running e2fsck is recommended");
1911
	else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1912 1913
		 le16_to_cpu(es->s_mnt_count) >=
		 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1914 1915 1916
		ext4_msg(sb, KERN_WARNING,
			 "warning: maximal mount count reached, "
			 "running e2fsck is recommended");
1917 1918 1919
	else if (le32_to_cpu(es->s_checkinterval) &&
		(le32_to_cpu(es->s_lastcheck) +
			le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1920 1921 1922
		ext4_msg(sb, KERN_WARNING,
			 "warning: checktime reached, "
			 "running e2fsck is recommended");
1923
	if (!sbi->s_journal)
1924
		es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1925
	if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1926
		es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
M
Marcin Slusarz 已提交
1927
	le16_add_cpu(&es->s_mnt_count, 1);
1928
	es->s_mtime = cpu_to_le32(get_seconds());
1929
	ext4_update_dynamic_rev(sb);
1930 1931
	if (sbi->s_journal)
		EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1932

1933
	ext4_commit_super(sb, 1);
1934
done:
1935
	if (test_opt(sb, DEBUG))
1936
		printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
1937
				"bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
1938 1939
			sb->s_blocksize,
			sbi->s_groups_count,
1940 1941
			EXT4_BLOCKS_PER_GROUP(sb),
			EXT4_INODES_PER_GROUP(sb),
1942
			sbi->s_mount_opt, sbi->s_mount_opt2);
1943

D
Dan Magenheimer 已提交
1944
	cleancache_init_fs(sb);
1945 1946 1947
	return res;
}

1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979
int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct flex_groups *new_groups;
	int size;

	if (!sbi->s_log_groups_per_flex)
		return 0;

	size = ext4_flex_group(sbi, ngroup - 1) + 1;
	if (size <= sbi->s_flex_groups_allocated)
		return 0;

	size = roundup_pow_of_two(size * sizeof(struct flex_groups));
	new_groups = ext4_kvzalloc(size, GFP_KERNEL);
	if (!new_groups) {
		ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
			 size / (int) sizeof(struct flex_groups));
		return -ENOMEM;
	}

	if (sbi->s_flex_groups) {
		memcpy(new_groups, sbi->s_flex_groups,
		       (sbi->s_flex_groups_allocated *
			sizeof(struct flex_groups)));
		ext4_kvfree(sbi->s_flex_groups);
	}
	sbi->s_flex_groups = new_groups;
	sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
	return 0;
}

1980 1981 1982 1983 1984
static int ext4_fill_flex_info(struct super_block *sb)
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_group_desc *gdp = NULL;
	ext4_group_t flex_group;
1985
	int i, err;
1986

1987
	sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1988
	if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
1989 1990 1991 1992
		sbi->s_log_groups_per_flex = 0;
		return 1;
	}

1993 1994
	err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
	if (err)
1995
		goto failed;
1996 1997

	for (i = 0; i < sbi->s_groups_count; i++) {
1998
		gdp = ext4_get_group_desc(sb, i, NULL);
1999 2000

		flex_group = ext4_flex_group(sbi, i);
2001 2002
		atomic_add(ext4_free_inodes_count(sb, gdp),
			   &sbi->s_flex_groups[flex_group].free_inodes);
2003 2004
		atomic64_add(ext4_free_group_clusters(sb, gdp),
			     &sbi->s_flex_groups[flex_group].free_clusters);
2005 2006
		atomic_add(ext4_used_dirs_count(sb, gdp),
			   &sbi->s_flex_groups[flex_group].used_dirs);
2007 2008 2009 2010 2011 2012 2013
	}

	return 1;
failed:
	return 0;
}

2014 2015
static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
				   struct ext4_group_desc *gdp)
A
Andreas Dilger 已提交
2016
{
2017
	int offset;
A
Andreas Dilger 已提交
2018
	__u16 crc = 0;
2019
	__le32 le_group = cpu_to_le32(block_group);
A
Andreas Dilger 已提交
2020

2021 2022 2023
	if ((sbi->s_es->s_feature_ro_compat &
	     cpu_to_le32(EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))) {
		/* Use new metadata_csum algorithm */
2024
		__le16 save_csum;
2025 2026
		__u32 csum32;

2027
		save_csum = gdp->bg_checksum;
2028 2029 2030 2031 2032
		gdp->bg_checksum = 0;
		csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
				     sizeof(le_group));
		csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp,
				     sbi->s_desc_size);
2033
		gdp->bg_checksum = save_csum;
2034 2035 2036

		crc = csum32 & 0xFFFF;
		goto out;
A
Andreas Dilger 已提交
2037 2038
	}

2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054
	/* old crc16 code */
	offset = offsetof(struct ext4_group_desc, bg_checksum);

	crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
	crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
	crc = crc16(crc, (__u8 *)gdp, offset);
	offset += sizeof(gdp->bg_checksum); /* skip checksum */
	/* for checksum of struct ext4_group_desc do the rest...*/
	if ((sbi->s_es->s_feature_incompat &
	     cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
	    offset < le16_to_cpu(sbi->s_es->s_desc_size))
		crc = crc16(crc, (__u8 *)gdp + offset,
			    le16_to_cpu(sbi->s_es->s_desc_size) -
				offset);

out:
A
Andreas Dilger 已提交
2055 2056 2057
	return cpu_to_le16(crc);
}

2058
int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
A
Andreas Dilger 已提交
2059 2060
				struct ext4_group_desc *gdp)
{
2061 2062 2063
	if (ext4_has_group_desc_csum(sb) &&
	    (gdp->bg_checksum != ext4_group_desc_csum(EXT4_SB(sb),
						      block_group, gdp)))
A
Andreas Dilger 已提交
2064 2065 2066 2067 2068
		return 0;

	return 1;
}

2069 2070 2071 2072 2073 2074 2075 2076
void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
			      struct ext4_group_desc *gdp)
{
	if (!ext4_has_group_desc_csum(sb))
		return;
	gdp->bg_checksum = ext4_group_desc_csum(EXT4_SB(sb), block_group, gdp);
}

2077
/* Called at mount-time, super-block is locked */
2078 2079
static int ext4_check_descriptors(struct super_block *sb,
				  ext4_group_t *first_not_zeroed)
2080
{
2081 2082 2083
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
	ext4_fsblk_t last_block;
L
Laurent Vivier 已提交
2084 2085 2086
	ext4_fsblk_t block_bitmap;
	ext4_fsblk_t inode_bitmap;
	ext4_fsblk_t inode_table;
J
Jose R. Santos 已提交
2087
	int flexbg_flag = 0;
2088
	ext4_group_t i, grp = sbi->s_groups_count;
2089

J
Jose R. Santos 已提交
2090 2091 2092
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
		flexbg_flag = 1;

2093
	ext4_debug("Checking group descriptors");
2094

2095 2096 2097
	for (i = 0; i < sbi->s_groups_count; i++) {
		struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);

J
Jose R. Santos 已提交
2098
		if (i == sbi->s_groups_count - 1 || flexbg_flag)
L
Laurent Vivier 已提交
2099
			last_block = ext4_blocks_count(sbi->s_es) - 1;
2100 2101
		else
			last_block = first_block +
2102
				(EXT4_BLOCKS_PER_GROUP(sb) - 1);
2103

2104 2105 2106 2107
		if ((grp == sbi->s_groups_count) &&
		   !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
			grp = i;

2108
		block_bitmap = ext4_block_bitmap(sb, gdp);
2109
		if (block_bitmap < first_block || block_bitmap > last_block) {
2110
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2111
			       "Block bitmap for group %u not in group "
2112
			       "(block %llu)!", i, block_bitmap);
2113 2114
			return 0;
		}
2115
		inode_bitmap = ext4_inode_bitmap(sb, gdp);
2116
		if (inode_bitmap < first_block || inode_bitmap > last_block) {
2117
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2118
			       "Inode bitmap for group %u not in group "
2119
			       "(block %llu)!", i, inode_bitmap);
2120 2121
			return 0;
		}
2122
		inode_table = ext4_inode_table(sb, gdp);
L
Laurent Vivier 已提交
2123
		if (inode_table < first_block ||
2124
		    inode_table + sbi->s_itb_per_group - 1 > last_block) {
2125
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2126
			       "Inode table for group %u not in group "
2127
			       "(block %llu)!", i, inode_table);
2128 2129
			return 0;
		}
2130
		ext4_lock_group(sb, i);
2131
		if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
2132 2133 2134 2135
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
				 "Checksum for group %u failed (%u!=%u)",
				 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
				     gdp)), le16_to_cpu(gdp->bg_checksum));
2136
			if (!(sb->s_flags & MS_RDONLY)) {
2137
				ext4_unlock_group(sb, i);
2138
				return 0;
2139
			}
A
Andreas Dilger 已提交
2140
		}
2141
		ext4_unlock_group(sb, i);
J
Jose R. Santos 已提交
2142 2143
		if (!flexbg_flag)
			first_block += EXT4_BLOCKS_PER_GROUP(sb);
2144
	}
2145 2146
	if (NULL != first_not_zeroed)
		*first_not_zeroed = grp;
2147

2148 2149
	ext4_free_blocks_count_set(sbi->s_es,
				   EXT4_C2B(sbi, ext4_count_free_clusters(sb)));
2150
	sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
2151 2152 2153
	return 1;
}

2154
/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166
 * the superblock) which were deleted from all directories, but held open by
 * a process at the time of a crash.  We walk the list and try to delete these
 * inodes at recovery time (only with a read-write filesystem).
 *
 * In order to keep the orphan inode chain consistent during traversal (in
 * case of crash during recovery), we link each inode into the superblock
 * orphan list_head and handle it the same way as an inode deletion during
 * normal operation (which journals the operations for us).
 *
 * We only do an iget() and an iput() on each inode, which is very safe if we
 * accidentally point at an in-use or already deleted inode.  The worst that
 * can happen in this case is that we get a "bit already cleared" message from
2167
 * ext4_free_inode().  The only reason we would point at a wrong inode is if
2168 2169 2170
 * e2fsck was run on this filesystem, and it must have already done the orphan
 * inode cleanup for us, so we can safely abort without any further action.
 */
2171 2172
static void ext4_orphan_cleanup(struct super_block *sb,
				struct ext4_super_block *es)
2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183
{
	unsigned int s_flags = sb->s_flags;
	int nr_orphans = 0, nr_truncates = 0;
#ifdef CONFIG_QUOTA
	int i;
#endif
	if (!es->s_last_orphan) {
		jbd_debug(4, "no orphan inodes to clean up\n");
		return;
	}

2184
	if (bdev_read_only(sb->s_bdev)) {
2185 2186
		ext4_msg(sb, KERN_ERR, "write access "
			"unavailable, skipping orphan cleanup");
2187 2188 2189
		return;
	}

2190 2191 2192 2193 2194 2195 2196
	/* Check if feature set would not allow a r/w mount */
	if (!ext4_feature_set_ok(sb, 0)) {
		ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
			 "unknown ROCOMPAT features");
		return;
	}

2197
	if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2198 2199
		/* don't clear list on RO mount w/ errors */
		if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
2200 2201
			jbd_debug(1, "Errors on filesystem, "
				  "clearing orphan list.\n");
2202 2203
			es->s_last_orphan = 0;
		}
2204 2205 2206 2207 2208
		jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
		return;
	}

	if (s_flags & MS_RDONLY) {
2209
		ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
2210 2211 2212 2213 2214 2215 2216
		sb->s_flags &= ~MS_RDONLY;
	}
#ifdef CONFIG_QUOTA
	/* Needed for iput() to work correctly and not trash data */
	sb->s_flags |= MS_ACTIVE;
	/* Turn on quotas so that they are updated correctly */
	for (i = 0; i < MAXQUOTAS; i++) {
2217 2218
		if (EXT4_SB(sb)->s_qf_names[i]) {
			int ret = ext4_quota_on_mount(sb, i);
2219
			if (ret < 0)
2220 2221 2222
				ext4_msg(sb, KERN_ERR,
					"Cannot turn on journaled "
					"quota: error %d", ret);
2223 2224 2225 2226 2227 2228 2229
		}
	}
#endif

	while (es->s_last_orphan) {
		struct inode *inode;

2230 2231
		inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
		if (IS_ERR(inode)) {
2232 2233 2234 2235
			es->s_last_orphan = 0;
			break;
		}

2236
		list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2237
		dquot_initialize(inode);
2238
		if (inode->i_nlink) {
2239 2240 2241 2242
			if (test_opt(sb, DEBUG))
				ext4_msg(sb, KERN_DEBUG,
					"%s: truncating inode %lu to %lld bytes",
					__func__, inode->i_ino, inode->i_size);
2243
			jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2244
				  inode->i_ino, inode->i_size);
2245
			mutex_lock(&inode->i_mutex);
2246
			truncate_inode_pages(inode->i_mapping, inode->i_size);
2247
			ext4_truncate(inode);
2248
			mutex_unlock(&inode->i_mutex);
2249 2250
			nr_truncates++;
		} else {
2251 2252 2253 2254
			if (test_opt(sb, DEBUG))
				ext4_msg(sb, KERN_DEBUG,
					"%s: deleting unreferenced inode %lu",
					__func__, inode->i_ino);
2255 2256 2257 2258 2259 2260 2261
			jbd_debug(2, "deleting unreferenced inode %lu\n",
				  inode->i_ino);
			nr_orphans++;
		}
		iput(inode);  /* The delete magic happens here! */
	}

2262
#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2263 2264

	if (nr_orphans)
2265 2266
		ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
		       PLURAL(nr_orphans));
2267
	if (nr_truncates)
2268 2269
		ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
		       PLURAL(nr_truncates));
2270 2271 2272 2273
#ifdef CONFIG_QUOTA
	/* Turn quotas off */
	for (i = 0; i < MAXQUOTAS; i++) {
		if (sb_dqopt(sb)->files[i])
2274
			dquot_quota_off(sb, i);
2275 2276 2277 2278
	}
#endif
	sb->s_flags = s_flags; /* Restore MS_RDONLY status */
}
2279

2280 2281 2282 2283 2284 2285 2286
/*
 * Maximal extent format file size.
 * Resulting logical blkno at s_maxbytes must fit in our on-disk
 * extent format containers, within a sector_t, and within i_blocks
 * in the vfs.  ext4 inode has 48 bits of i_block in fsblock units,
 * so that won't be a limiting factor.
 *
2287 2288 2289 2290 2291 2292
 * However there is other limiting factor. We do store extents in the form
 * of starting block and length, hence the resulting length of the extent
 * covering maximum file size must fit into on-disk format containers as
 * well. Given that length is always by 1 unit bigger than max unit (because
 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
 *
2293 2294
 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
 */
2295
static loff_t ext4_max_size(int blkbits, int has_huge_files)
2296 2297 2298 2299 2300
{
	loff_t res;
	loff_t upper_limit = MAX_LFS_FILESIZE;

	/* small i_blocks in vfs inode? */
2301
	if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2302
		/*
2303
		 * CONFIG_LBDAF is not enabled implies the inode
2304 2305 2306 2307 2308 2309 2310 2311 2312 2313
		 * i_block represent total blocks in 512 bytes
		 * 32 == size of vfs inode i_blocks * 8
		 */
		upper_limit = (1LL << 32) - 1;

		/* total blocks in file system block size */
		upper_limit >>= (blkbits - 9);
		upper_limit <<= blkbits;
	}

2314 2315 2316 2317 2318 2319
	/*
	 * 32-bit extent-start container, ee_block. We lower the maxbytes
	 * by one fs block, so ee_len can cover the extent of maximum file
	 * size
	 */
	res = (1LL << 32) - 1;
2320 2321 2322 2323 2324 2325 2326 2327
	res <<= blkbits;

	/* Sanity check against vm- & vfs- imposed limits */
	if (res > upper_limit)
		res = upper_limit;

	return res;
}
2328 2329

/*
2330
 * Maximal bitmap file size.  There is a direct, and {,double-,triple-}indirect
2331 2332
 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
 * We need to be 1 filesystem block less than the 2^48 sector limit.
2333
 */
2334
static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2335
{
2336
	loff_t res = EXT4_NDIR_BLOCKS;
2337 2338
	int meta_blocks;
	loff_t upper_limit;
2339 2340 2341 2342 2343 2344
	/* This is calculated to be the largest file size for a dense, block
	 * mapped file such that the file's total number of 512-byte sectors,
	 * including data and all indirect blocks, does not exceed (2^48 - 1).
	 *
	 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
	 * number of 512-byte sectors of the file.
2345 2346
	 */

2347
	if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2348
		/*
2349
		 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2350 2351
		 * the inode i_block field represents total file blocks in
		 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2352 2353 2354 2355 2356 2357 2358
		 */
		upper_limit = (1LL << 32) - 1;

		/* total blocks in file system block size */
		upper_limit >>= (bits - 9);

	} else {
A
Aneesh Kumar K.V 已提交
2359 2360 2361 2362 2363 2364
		/*
		 * We use 48 bit ext4_inode i_blocks
		 * With EXT4_HUGE_FILE_FL set the i_blocks
		 * represent total number of blocks in
		 * file system block size
		 */
2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377
		upper_limit = (1LL << 48) - 1;

	}

	/* indirect blocks */
	meta_blocks = 1;
	/* double indirect blocks */
	meta_blocks += 1 + (1LL << (bits-2));
	/* tripple indirect blocks */
	meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));

	upper_limit -= meta_blocks;
	upper_limit <<= bits;
2378 2379 2380 2381 2382 2383 2384

	res += 1LL << (bits-2);
	res += 1LL << (2*(bits-2));
	res += 1LL << (3*(bits-2));
	res <<= bits;
	if (res > upper_limit)
		res = upper_limit;
2385 2386 2387 2388

	if (res > MAX_LFS_FILESIZE)
		res = MAX_LFS_FILESIZE;

2389 2390 2391
	return res;
}

2392
static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2393
				   ext4_fsblk_t logical_sb_block, int nr)
2394
{
2395
	struct ext4_sb_info *sbi = EXT4_SB(sb);
2396
	ext4_group_t bg, first_meta_bg;
2397 2398 2399 2400
	int has_super = 0;

	first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);

2401
	if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
2402
	    nr < first_meta_bg)
2403
		return logical_sb_block + nr + 1;
2404
	bg = sbi->s_desc_per_block * nr;
2405
	if (ext4_bg_has_super(sb, bg))
2406
		has_super = 1;
2407

2408
	return (has_super + ext4_group_first_block_no(sb, bg));
2409 2410
}

2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426
/**
 * ext4_get_stripe_size: Get the stripe size.
 * @sbi: In memory super block info
 *
 * If we have specified it via mount option, then
 * use the mount option value. If the value specified at mount time is
 * greater than the blocks per group use the super block value.
 * If the super block value is greater than blocks per group return 0.
 * Allocator needs it be less than blocks per group.
 *
 */
static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
{
	unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
	unsigned long stripe_width =
			le32_to_cpu(sbi->s_es->s_raid_stripe_width);
D
Dan Ehrenberg 已提交
2427
	int ret;
2428 2429

	if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
D
Dan Ehrenberg 已提交
2430 2431 2432 2433 2434 2435 2436
		ret = sbi->s_stripe;
	else if (stripe_width <= sbi->s_blocks_per_group)
		ret = stripe_width;
	else if (stride <= sbi->s_blocks_per_group)
		ret = stride;
	else
		ret = 0;
2437

D
Dan Ehrenberg 已提交
2438 2439 2440 2441 2442 2443
	/*
	 * If the stripe width is 1, this makes no sense and
	 * we set it to 0 to turn off stripe handling code.
	 */
	if (ret <= 1)
		ret = 0;
2444

D
Dan Ehrenberg 已提交
2445
	return ret;
2446
}
2447

T
Theodore Ts'o 已提交
2448 2449 2450 2451 2452
/* sysfs supprt */

struct ext4_attr {
	struct attribute attr;
	ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
2453
	ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
T
Theodore Ts'o 已提交
2454
			 const char *, size_t);
2455 2456 2457 2458
	union {
		int offset;
		int deprecated_val;
	} u;
T
Theodore Ts'o 已提交
2459 2460
};

L
Lukas Czerner 已提交
2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471
static int parse_strtoull(const char *buf,
		unsigned long long max, unsigned long long *value)
{
	int ret;

	ret = kstrtoull(skip_spaces(buf), 0, value);
	if (!ret && *value > max)
		ret = -EINVAL;
	return ret;
}

T
Theodore Ts'o 已提交
2472 2473 2474 2475 2476
static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
					      struct ext4_sb_info *sbi,
					      char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%llu\n",
2477 2478
		(s64) EXT4_C2B(sbi,
			percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
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}

static ssize_t session_write_kbytes_show(struct ext4_attr *a,
					 struct ext4_sb_info *sbi, char *buf)
{
	struct super_block *sb = sbi->s_buddy_cache->i_sb;

2486 2487
	if (!sb->s_bdev->bd_part)
		return snprintf(buf, PAGE_SIZE, "0\n");
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	return snprintf(buf, PAGE_SIZE, "%lu\n",
			(part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
			 sbi->s_sectors_written_start) >> 1);
}

static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
					  struct ext4_sb_info *sbi, char *buf)
{
	struct super_block *sb = sbi->s_buddy_cache->i_sb;

2498 2499
	if (!sb->s_bdev->bd_part)
		return snprintf(buf, PAGE_SIZE, "0\n");
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	return snprintf(buf, PAGE_SIZE, "%llu\n",
2501
			(unsigned long long)(sbi->s_kbytes_written +
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			((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2503
			  EXT4_SB(sb)->s_sectors_written_start) >> 1)));
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}

static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
					  struct ext4_sb_info *sbi,
					  const char *buf, size_t count)
{
	unsigned long t;
2511
	int ret;
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2512

2513 2514 2515
	ret = kstrtoul(skip_spaces(buf), 0, &t);
	if (ret)
		return ret;
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2516

2517
	if (t && (!is_power_of_2(t) || t > 0x40000000))
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		return -EINVAL;

	sbi->s_inode_readahead_blks = t;
	return count;
}

static ssize_t sbi_ui_show(struct ext4_attr *a,
2525
			   struct ext4_sb_info *sbi, char *buf)
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{
2527
	unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset);
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	return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
}

static ssize_t sbi_ui_store(struct ext4_attr *a,
			    struct ext4_sb_info *sbi,
			    const char *buf, size_t count)
{
2536
	unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset);
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2537
	unsigned long t;
2538
	int ret;
T
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2539

2540 2541 2542
	ret = kstrtoul(skip_spaces(buf), 0, &t);
	if (ret)
		return ret;
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2543 2544 2545 2546
	*ui = t;
	return count;
}

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static ssize_t reserved_clusters_show(struct ext4_attr *a,
				  struct ext4_sb_info *sbi, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%llu\n",
		(unsigned long long) atomic64_read(&sbi->s_resv_clusters));
}

static ssize_t reserved_clusters_store(struct ext4_attr *a,
				   struct ext4_sb_info *sbi,
				   const char *buf, size_t count)
{
	unsigned long long val;
	int ret;

	if (parse_strtoull(buf, -1ULL, &val))
		return -EINVAL;
	ret = ext4_reserve_clusters(sbi, val);

	return ret ? ret : count;
}

2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584
static ssize_t trigger_test_error(struct ext4_attr *a,
				  struct ext4_sb_info *sbi,
				  const char *buf, size_t count)
{
	int len = count;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	if (len && buf[len-1] == '\n')
		len--;

	if (len)
		ext4_error(sbi->s_sb, "%.*s", len, buf);
	return count;
}

2585 2586 2587 2588 2589 2590
static ssize_t sbi_deprecated_show(struct ext4_attr *a,
				   struct ext4_sb_info *sbi, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%d\n", a->u.deprecated_val);
}

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#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
static struct ext4_attr ext4_attr_##_name = {			\
	.attr = {.name = __stringify(_name), .mode = _mode },	\
	.show	= _show,					\
	.store	= _store,					\
2596 2597 2598
	.u = {							\
		.offset = offsetof(struct ext4_sb_info, _elname),\
	},							\
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}
#define EXT4_ATTR(name, mode, show, store) \
static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)

2603
#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
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#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
#define EXT4_RW_ATTR_SBI_UI(name, elname)	\
	EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
#define ATTR_LIST(name) &ext4_attr_##name.attr
2609 2610 2611 2612 2613 2614 2615 2616
#define EXT4_DEPRECATED_ATTR(_name, _val)	\
static struct ext4_attr ext4_attr_##_name = {			\
	.attr = {.name = __stringify(_name), .mode = 0444 },	\
	.show	= sbi_deprecated_show,				\
	.u = {							\
		.deprecated_val = _val,				\
	},							\
}
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EXT4_RO_ATTR(delayed_allocation_blocks);
EXT4_RO_ATTR(session_write_kbytes);
EXT4_RO_ATTR(lifetime_write_kbytes);
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EXT4_RW_ATTR(reserved_clusters);
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EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
		 inode_readahead_blks_store, s_inode_readahead_blks);
2624
EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
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EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
2631
EXT4_DEPRECATED_ATTR(max_writeback_mb_bump, 128);
2632
EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
2633
EXT4_ATTR(trigger_fs_error, 0200, NULL, trigger_test_error);
2634 2635 2636 2637 2638 2639
EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval);
EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst, s_err_ratelimit_state.burst);
EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval);
EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst);
EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval);
EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst);
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static struct attribute *ext4_attrs[] = {
	ATTR_LIST(delayed_allocation_blocks),
	ATTR_LIST(session_write_kbytes),
	ATTR_LIST(lifetime_write_kbytes),
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2645
	ATTR_LIST(reserved_clusters),
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2646
	ATTR_LIST(inode_readahead_blks),
2647
	ATTR_LIST(inode_goal),
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2648 2649 2650 2651 2652 2653
	ATTR_LIST(mb_stats),
	ATTR_LIST(mb_max_to_scan),
	ATTR_LIST(mb_min_to_scan),
	ATTR_LIST(mb_order2_req),
	ATTR_LIST(mb_stream_req),
	ATTR_LIST(mb_group_prealloc),
2654
	ATTR_LIST(max_writeback_mb_bump),
2655
	ATTR_LIST(extent_max_zeroout_kb),
2656
	ATTR_LIST(trigger_fs_error),
2657 2658 2659 2660 2661 2662
	ATTR_LIST(err_ratelimit_interval_ms),
	ATTR_LIST(err_ratelimit_burst),
	ATTR_LIST(warning_ratelimit_interval_ms),
	ATTR_LIST(warning_ratelimit_burst),
	ATTR_LIST(msg_ratelimit_interval_ms),
	ATTR_LIST(msg_ratelimit_burst),
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2663 2664 2665
	NULL,
};

2666 2667
/* Features this copy of ext4 supports */
EXT4_INFO_ATTR(lazy_itable_init);
2668
EXT4_INFO_ATTR(batched_discard);
2669
EXT4_INFO_ATTR(meta_bg_resize);
2670 2671 2672

static struct attribute *ext4_feat_attrs[] = {
	ATTR_LIST(lazy_itable_init),
2673
	ATTR_LIST(batched_discard),
2674
	ATTR_LIST(meta_bg_resize),
2675 2676 2677
	NULL,
};

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static ssize_t ext4_attr_show(struct kobject *kobj,
			      struct attribute *attr, char *buf)
{
	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
						s_kobj);
	struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);

	return a->show ? a->show(a, sbi, buf) : 0;
}

static ssize_t ext4_attr_store(struct kobject *kobj,
			       struct attribute *attr,
			       const char *buf, size_t len)
{
	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
						s_kobj);
	struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);

	return a->store ? a->store(a, sbi, buf, len) : 0;
}

static void ext4_sb_release(struct kobject *kobj)
{
	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
						s_kobj);
	complete(&sbi->s_kobj_unregister);
}

2706
static const struct sysfs_ops ext4_attr_ops = {
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	.show	= ext4_attr_show,
	.store	= ext4_attr_store,
};

static struct kobj_type ext4_ktype = {
	.default_attrs	= ext4_attrs,
	.sysfs_ops	= &ext4_attr_ops,
	.release	= ext4_sb_release,
};

2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727
static void ext4_feat_release(struct kobject *kobj)
{
	complete(&ext4_feat->f_kobj_unregister);
}

static struct kobj_type ext4_feat_ktype = {
	.default_attrs	= ext4_feat_attrs,
	.sysfs_ops	= &ext4_attr_ops,
	.release	= ext4_feat_release,
};

2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767
/*
 * Check whether this filesystem can be mounted based on
 * the features present and the RDONLY/RDWR mount requested.
 * Returns 1 if this filesystem can be mounted as requested,
 * 0 if it cannot be.
 */
static int ext4_feature_set_ok(struct super_block *sb, int readonly)
{
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
		ext4_msg(sb, KERN_ERR,
			"Couldn't mount because of "
			"unsupported optional features (%x)",
			(le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
			~EXT4_FEATURE_INCOMPAT_SUPP));
		return 0;
	}

	if (readonly)
		return 1;

	/* Check that feature set is OK for a read-write mount */
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
		ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
			 "unsupported optional features (%x)",
			 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
				~EXT4_FEATURE_RO_COMPAT_SUPP));
		return 0;
	}
	/*
	 * Large file size enabled file system can only be mounted
	 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
	 */
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
		if (sizeof(blkcnt_t) < sizeof(u64)) {
			ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
				 "cannot be mounted RDWR without "
				 "CONFIG_LBDAF");
			return 0;
		}
	}
2768 2769 2770 2771 2772 2773 2774
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
	    !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
		ext4_msg(sb, KERN_ERR,
			 "Can't support bigalloc feature without "
			 "extents feature\n");
		return 0;
	}
2775 2776 2777 2778 2779 2780 2781 2782 2783 2784

#ifndef CONFIG_QUOTA
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
	    !readonly) {
		ext4_msg(sb, KERN_ERR,
			 "Filesystem with quota feature cannot be mounted RDWR "
			 "without CONFIG_QUOTA");
		return 0;
	}
#endif  /* CONFIG_QUOTA */
2785 2786 2787
	return 1;
}

2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834
/*
 * This function is called once a day if we have errors logged
 * on the file system
 */
static void print_daily_error_info(unsigned long arg)
{
	struct super_block *sb = (struct super_block *) arg;
	struct ext4_sb_info *sbi;
	struct ext4_super_block *es;

	sbi = EXT4_SB(sb);
	es = sbi->s_es;

	if (es->s_error_count)
		ext4_msg(sb, KERN_NOTICE, "error count: %u",
			 le32_to_cpu(es->s_error_count));
	if (es->s_first_error_time) {
		printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
		       sb->s_id, le32_to_cpu(es->s_first_error_time),
		       (int) sizeof(es->s_first_error_func),
		       es->s_first_error_func,
		       le32_to_cpu(es->s_first_error_line));
		if (es->s_first_error_ino)
			printk(": inode %u",
			       le32_to_cpu(es->s_first_error_ino));
		if (es->s_first_error_block)
			printk(": block %llu", (unsigned long long)
			       le64_to_cpu(es->s_first_error_block));
		printk("\n");
	}
	if (es->s_last_error_time) {
		printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
		       sb->s_id, le32_to_cpu(es->s_last_error_time),
		       (int) sizeof(es->s_last_error_func),
		       es->s_last_error_func,
		       le32_to_cpu(es->s_last_error_line));
		if (es->s_last_error_ino)
			printk(": inode %u",
			       le32_to_cpu(es->s_last_error_ino));
		if (es->s_last_error_block)
			printk(": block %llu", (unsigned long long)
			       le64_to_cpu(es->s_last_error_block));
		printk("\n");
	}
	mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ);  /* Once a day */
}

2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846
/* Find next suitable group and run ext4_init_inode_table */
static int ext4_run_li_request(struct ext4_li_request *elr)
{
	struct ext4_group_desc *gdp = NULL;
	ext4_group_t group, ngroups;
	struct super_block *sb;
	unsigned long timeout = 0;
	int ret = 0;

	sb = elr->lr_super;
	ngroups = EXT4_SB(sb)->s_groups_count;

2847
	sb_start_write(sb);
2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858
	for (group = elr->lr_next_group; group < ngroups; group++) {
		gdp = ext4_get_group_desc(sb, group, NULL);
		if (!gdp) {
			ret = 1;
			break;
		}

		if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
			break;
	}

2859
	if (group >= ngroups)
2860 2861 2862 2863 2864 2865 2866
		ret = 1;

	if (!ret) {
		timeout = jiffies;
		ret = ext4_init_inode_table(sb, group,
					    elr->lr_timeout ? 0 : 1);
		if (elr->lr_timeout == 0) {
2867 2868
			timeout = (jiffies - timeout) *
				  elr->lr_sbi->s_li_wait_mult;
2869 2870 2871 2872 2873
			elr->lr_timeout = timeout;
		}
		elr->lr_next_sched = jiffies + elr->lr_timeout;
		elr->lr_next_group = group + 1;
	}
2874
	sb_end_write(sb);
2875 2876 2877 2878 2879 2880

	return ret;
}

/*
 * Remove lr_request from the list_request and free the
2881
 * request structure. Should be called with li_list_mtx held
2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898
 */
static void ext4_remove_li_request(struct ext4_li_request *elr)
{
	struct ext4_sb_info *sbi;

	if (!elr)
		return;

	sbi = elr->lr_sbi;

	list_del(&elr->lr_request);
	sbi->s_li_request = NULL;
	kfree(elr);
}

static void ext4_unregister_li_request(struct super_block *sb)
{
2899 2900 2901
	mutex_lock(&ext4_li_mtx);
	if (!ext4_li_info) {
		mutex_unlock(&ext4_li_mtx);
2902
		return;
2903
	}
2904 2905

	mutex_lock(&ext4_li_info->li_list_mtx);
2906
	ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
2907
	mutex_unlock(&ext4_li_info->li_list_mtx);
2908
	mutex_unlock(&ext4_li_mtx);
2909 2910
}

2911 2912
static struct task_struct *ext4_lazyinit_task;

2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926
/*
 * This is the function where ext4lazyinit thread lives. It walks
 * through the request list searching for next scheduled filesystem.
 * When such a fs is found, run the lazy initialization request
 * (ext4_rn_li_request) and keep track of the time spend in this
 * function. Based on that time we compute next schedule time of
 * the request. When walking through the list is complete, compute
 * next waking time and put itself into sleep.
 */
static int ext4_lazyinit_thread(void *arg)
{
	struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
	struct list_head *pos, *n;
	struct ext4_li_request *elr;
2927
	unsigned long next_wakeup, cur;
2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944

	BUG_ON(NULL == eli);

cont_thread:
	while (true) {
		next_wakeup = MAX_JIFFY_OFFSET;

		mutex_lock(&eli->li_list_mtx);
		if (list_empty(&eli->li_request_list)) {
			mutex_unlock(&eli->li_list_mtx);
			goto exit_thread;
		}

		list_for_each_safe(pos, n, &eli->li_request_list) {
			elr = list_entry(pos, struct ext4_li_request,
					 lr_request);

2945 2946 2947 2948 2949 2950
			if (time_after_eq(jiffies, elr->lr_next_sched)) {
				if (ext4_run_li_request(elr) != 0) {
					/* error, remove the lazy_init job */
					ext4_remove_li_request(elr);
					continue;
				}
2951 2952 2953 2954 2955 2956 2957
			}

			if (time_before(elr->lr_next_sched, next_wakeup))
				next_wakeup = elr->lr_next_sched;
		}
		mutex_unlock(&eli->li_list_mtx);

2958
		try_to_freeze();
2959

2960 2961
		cur = jiffies;
		if ((time_after_eq(cur, next_wakeup)) ||
2962
		    (MAX_JIFFY_OFFSET == next_wakeup)) {
2963 2964 2965 2966
			cond_resched();
			continue;
		}

2967 2968
		schedule_timeout_interruptible(next_wakeup - cur);

2969 2970 2971 2972
		if (kthread_should_stop()) {
			ext4_clear_request_list();
			goto exit_thread;
		}
2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014
	}

exit_thread:
	/*
	 * It looks like the request list is empty, but we need
	 * to check it under the li_list_mtx lock, to prevent any
	 * additions into it, and of course we should lock ext4_li_mtx
	 * to atomically free the list and ext4_li_info, because at
	 * this point another ext4 filesystem could be registering
	 * new one.
	 */
	mutex_lock(&ext4_li_mtx);
	mutex_lock(&eli->li_list_mtx);
	if (!list_empty(&eli->li_request_list)) {
		mutex_unlock(&eli->li_list_mtx);
		mutex_unlock(&ext4_li_mtx);
		goto cont_thread;
	}
	mutex_unlock(&eli->li_list_mtx);
	kfree(ext4_li_info);
	ext4_li_info = NULL;
	mutex_unlock(&ext4_li_mtx);

	return 0;
}

static void ext4_clear_request_list(void)
{
	struct list_head *pos, *n;
	struct ext4_li_request *elr;

	mutex_lock(&ext4_li_info->li_list_mtx);
	list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
		elr = list_entry(pos, struct ext4_li_request,
				 lr_request);
		ext4_remove_li_request(elr);
	}
	mutex_unlock(&ext4_li_info->li_list_mtx);
}

static int ext4_run_lazyinit_thread(void)
{
3015 3016 3017 3018
	ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
					 ext4_li_info, "ext4lazyinit");
	if (IS_ERR(ext4_lazyinit_task)) {
		int err = PTR_ERR(ext4_lazyinit_task);
3019 3020 3021
		ext4_clear_request_list();
		kfree(ext4_li_info);
		ext4_li_info = NULL;
3022
		printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090
				 "initialization thread\n",
				 err);
		return err;
	}
	ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
	return 0;
}

/*
 * Check whether it make sense to run itable init. thread or not.
 * If there is at least one uninitialized inode table, return
 * corresponding group number, else the loop goes through all
 * groups and return total number of groups.
 */
static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
{
	ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
	struct ext4_group_desc *gdp = NULL;

	for (group = 0; group < ngroups; group++) {
		gdp = ext4_get_group_desc(sb, group, NULL);
		if (!gdp)
			continue;

		if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
			break;
	}

	return group;
}

static int ext4_li_info_new(void)
{
	struct ext4_lazy_init *eli = NULL;

	eli = kzalloc(sizeof(*eli), GFP_KERNEL);
	if (!eli)
		return -ENOMEM;

	INIT_LIST_HEAD(&eli->li_request_list);
	mutex_init(&eli->li_list_mtx);

	eli->li_state |= EXT4_LAZYINIT_QUIT;

	ext4_li_info = eli;

	return 0;
}

static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
					    ext4_group_t start)
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_li_request *elr;

	elr = kzalloc(sizeof(*elr), GFP_KERNEL);
	if (!elr)
		return NULL;

	elr->lr_super = sb;
	elr->lr_sbi = sbi;
	elr->lr_next_group = start;

	/*
	 * Randomize first schedule time of the request to
	 * spread the inode table initialization requests
	 * better.
	 */
3091 3092
	elr->lr_next_sched = jiffies + (prandom_u32() %
				(EXT4_DEF_LI_MAX_START_DELAY * HZ));
3093 3094 3095
	return elr;
}

3096 3097
int ext4_register_li_request(struct super_block *sb,
			     ext4_group_t first_not_zeroed)
3098 3099
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
3100
	struct ext4_li_request *elr = NULL;
3101
	ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
3102
	int ret = 0;
3103

3104
	mutex_lock(&ext4_li_mtx);
3105 3106 3107 3108 3109 3110
	if (sbi->s_li_request != NULL) {
		/*
		 * Reset timeout so it can be computed again, because
		 * s_li_wait_mult might have changed.
		 */
		sbi->s_li_request->lr_timeout = 0;
3111
		goto out;
3112
	}
3113 3114 3115

	if (first_not_zeroed == ngroups ||
	    (sb->s_flags & MS_RDONLY) ||
3116
	    !test_opt(sb, INIT_INODE_TABLE))
3117
		goto out;
3118 3119

	elr = ext4_li_request_new(sb, first_not_zeroed);
3120 3121 3122 3123
	if (!elr) {
		ret = -ENOMEM;
		goto out;
	}
3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135

	if (NULL == ext4_li_info) {
		ret = ext4_li_info_new();
		if (ret)
			goto out;
	}

	mutex_lock(&ext4_li_info->li_list_mtx);
	list_add(&elr->lr_request, &ext4_li_info->li_request_list);
	mutex_unlock(&ext4_li_info->li_list_mtx);

	sbi->s_li_request = elr;
3136 3137 3138 3139 3140 3141
	/*
	 * set elr to NULL here since it has been inserted to
	 * the request_list and the removal and free of it is
	 * handled by ext4_clear_request_list from now on.
	 */
	elr = NULL;
3142 3143 3144 3145 3146 3147 3148

	if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
		ret = ext4_run_lazyinit_thread();
		if (ret)
			goto out;
	}
out:
3149 3150
	mutex_unlock(&ext4_li_mtx);
	if (ret)
3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164
		kfree(elr);
	return ret;
}

/*
 * We do not need to lock anything since this is called on
 * module unload.
 */
static void ext4_destroy_lazyinit_thread(void)
{
	/*
	 * If thread exited earlier
	 * there's nothing to be done.
	 */
3165
	if (!ext4_li_info || !ext4_lazyinit_task)
3166 3167
		return;

3168
	kthread_stop(ext4_lazyinit_task);
3169 3170
}

3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208
static int set_journal_csum_feature_set(struct super_block *sb)
{
	int ret = 1;
	int compat, incompat;
	struct ext4_sb_info *sbi = EXT4_SB(sb);

	if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
		/* journal checksum v2 */
		compat = 0;
		incompat = JBD2_FEATURE_INCOMPAT_CSUM_V2;
	} else {
		/* journal checksum v1 */
		compat = JBD2_FEATURE_COMPAT_CHECKSUM;
		incompat = 0;
	}

	if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
		ret = jbd2_journal_set_features(sbi->s_journal,
				compat, 0,
				JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
				incompat);
	} else if (test_opt(sb, JOURNAL_CHECKSUM)) {
		ret = jbd2_journal_set_features(sbi->s_journal,
				compat, 0,
				incompat);
		jbd2_journal_clear_features(sbi->s_journal, 0, 0,
				JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
	} else {
		jbd2_journal_clear_features(sbi->s_journal,
				JBD2_FEATURE_COMPAT_CHECKSUM, 0,
				JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
				JBD2_FEATURE_INCOMPAT_CSUM_V2);
	}

	return ret;
}

3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232
/*
 * Note: calculating the overhead so we can be compatible with
 * historical BSD practice is quite difficult in the face of
 * clusters/bigalloc.  This is because multiple metadata blocks from
 * different block group can end up in the same allocation cluster.
 * Calculating the exact overhead in the face of clustered allocation
 * requires either O(all block bitmaps) in memory or O(number of block
 * groups**2) in time.  We will still calculate the superblock for
 * older file systems --- and if we come across with a bigalloc file
 * system with zero in s_overhead_clusters the estimate will be close to
 * correct especially for very large cluster sizes --- but for newer
 * file systems, it's better to calculate this figure once at mkfs
 * time, and store it in the superblock.  If the superblock value is
 * present (even for non-bigalloc file systems), we will use it.
 */
static int count_overhead(struct super_block *sb, ext4_group_t grp,
			  char *buf)
{
	struct ext4_sb_info	*sbi = EXT4_SB(sb);
	struct ext4_group_desc	*gdp;
	ext4_fsblk_t		first_block, last_block, b;
	ext4_group_t		i, ngroups = ext4_get_groups_count(sb);
	int			s, j, count = 0;

3233 3234 3235 3236
	if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC))
		return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
			sbi->s_itb_per_group + 2);

3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313
	first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
		(grp * EXT4_BLOCKS_PER_GROUP(sb));
	last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
	for (i = 0; i < ngroups; i++) {
		gdp = ext4_get_group_desc(sb, i, NULL);
		b = ext4_block_bitmap(sb, gdp);
		if (b >= first_block && b <= last_block) {
			ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
			count++;
		}
		b = ext4_inode_bitmap(sb, gdp);
		if (b >= first_block && b <= last_block) {
			ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
			count++;
		}
		b = ext4_inode_table(sb, gdp);
		if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
			for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
				int c = EXT4_B2C(sbi, b - first_block);
				ext4_set_bit(c, buf);
				count++;
			}
		if (i != grp)
			continue;
		s = 0;
		if (ext4_bg_has_super(sb, grp)) {
			ext4_set_bit(s++, buf);
			count++;
		}
		for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) {
			ext4_set_bit(EXT4_B2C(sbi, s++), buf);
			count++;
		}
	}
	if (!count)
		return 0;
	return EXT4_CLUSTERS_PER_GROUP(sb) -
		ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
}

/*
 * Compute the overhead and stash it in sbi->s_overhead
 */
int ext4_calculate_overhead(struct super_block *sb)
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
	ext4_group_t i, ngroups = ext4_get_groups_count(sb);
	ext4_fsblk_t overhead = 0;
	char *buf = (char *) get_zeroed_page(GFP_KERNEL);

	if (!buf)
		return -ENOMEM;

	/*
	 * Compute the overhead (FS structures).  This is constant
	 * for a given filesystem unless the number of block groups
	 * changes so we cache the previous value until it does.
	 */

	/*
	 * All of the blocks before first_data_block are overhead
	 */
	overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));

	/*
	 * Add the overhead found in each block group
	 */
	for (i = 0; i < ngroups; i++) {
		int blks;

		blks = count_overhead(sb, i, buf);
		overhead += blks;
		if (blks)
			memset(buf, 0, PAGE_SIZE);
		cond_resched();
	}
3314 3315
	/* Add the journal blocks as well */
	if (sbi->s_journal)
3316
		overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
3317

3318 3319 3320 3321 3322 3323
	sbi->s_overhead = overhead;
	smp_wmb();
	free_page((unsigned long) buf);
	return 0;
}

L
Lukas Czerner 已提交
3324

3325
static ext4_fsblk_t ext4_calculate_resv_clusters(struct super_block *sb)
L
Lukas Czerner 已提交
3326 3327 3328
{
	ext4_fsblk_t resv_clusters;

3329 3330 3331 3332 3333 3334 3335 3336
	/*
	 * There's no need to reserve anything when we aren't using extents.
	 * The space estimates are exact, there are no unwritten extents,
	 * hole punching doesn't need new metadata... This is needed especially
	 * to keep ext2/3 backward compatibility.
	 */
	if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS))
		return 0;
L
Lukas Czerner 已提交
3337 3338 3339 3340
	/*
	 * By default we reserve 2% or 4096 clusters, whichever is smaller.
	 * This should cover the situations where we can not afford to run
	 * out of space like for example punch hole, or converting
3341
	 * unwritten extents in delalloc path. In most cases such
L
Lukas Czerner 已提交
3342 3343 3344
	 * allocation would require 1, or 2 blocks, higher numbers are
	 * very rare.
	 */
3345 3346
	resv_clusters = ext4_blocks_count(EXT4_SB(sb)->s_es) >>
			EXT4_SB(sb)->s_cluster_bits;
L
Lukas Czerner 已提交
3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366

	do_div(resv_clusters, 50);
	resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);

	return resv_clusters;
}


static int ext4_reserve_clusters(struct ext4_sb_info *sbi, ext4_fsblk_t count)
{
	ext4_fsblk_t clusters = ext4_blocks_count(sbi->s_es) >>
				sbi->s_cluster_bits;

	if (count >= clusters)
		return -EINVAL;

	atomic64_set(&sbi->s_resv_clusters, count);
	return 0;
}

3367
static int ext4_fill_super(struct super_block *sb, void *data, int silent)
3368
{
3369
	char *orig_data = kstrdup(data, GFP_KERNEL);
3370
	struct buffer_head *bh;
3371 3372 3373 3374
	struct ext4_super_block *es = NULL;
	struct ext4_sb_info *sbi;
	ext4_fsblk_t block;
	ext4_fsblk_t sb_block = get_sb_block(&data);
3375
	ext4_fsblk_t logical_sb_block;
3376 3377 3378 3379
	unsigned long offset = 0;
	unsigned long journal_devnum = 0;
	unsigned long def_mount_opts;
	struct inode *root;
3380
	char *cp;
3381
	const char *descr;
3382
	int ret = -ENOMEM;
3383
	int blocksize, clustersize;
3384 3385
	unsigned int db_count;
	unsigned int i;
3386
	int needs_recovery, has_huge_files, has_bigalloc;
L
Laurent Vivier 已提交
3387
	__u64 blocks_count;
3388
	int err = 0;
3389
	unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3390
	ext4_group_t first_not_zeroed;
3391 3392 3393

	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
	if (!sbi)
3394
		goto out_free_orig;
3395 3396 3397 3398 3399

	sbi->s_blockgroup_lock =
		kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
	if (!sbi->s_blockgroup_lock) {
		kfree(sbi);
3400
		goto out_free_orig;
3401
	}
3402
	sb->s_fs_info = sbi;
3403
	sbi->s_sb = sb;
3404
	sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
M
Miklos Szeredi 已提交
3405
	sbi->s_sb_block = sb_block;
3406 3407 3408
	if (sb->s_bdev->bd_part)
		sbi->s_sectors_written_start =
			part_stat_read(sb->s_bdev->bd_part, sectors[1]);
3409

3410 3411 3412 3413
	/* Cleanup superblock name */
	for (cp = sb->s_id; (cp = strchr(cp, '/'));)
		*cp = '!';

3414
	/* -EINVAL is default */
3415
	ret = -EINVAL;
3416
	blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
3417
	if (!blocksize) {
3418
		ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3419 3420 3421 3422
		goto out_fail;
	}

	/*
3423
	 * The ext4 superblock will not be buffer aligned for other than 1kB
3424 3425
	 * block sizes.  We need to calculate the offset from buffer start.
	 */
3426
	if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3427 3428
		logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
		offset = do_div(logical_sb_block, blocksize);
3429
	} else {
3430
		logical_sb_block = sb_block;
3431 3432
	}

3433
	if (!(bh = sb_bread(sb, logical_sb_block))) {
3434
		ext4_msg(sb, KERN_ERR, "unable to read superblock");
3435 3436 3437 3438
		goto out_fail;
	}
	/*
	 * Note: s_es must be initialized as soon as possible because
3439
	 *       some ext4 macro-instructions depend on its value
3440
	 */
3441
	es = (struct ext4_super_block *) (bh->b_data + offset);
3442 3443
	sbi->s_es = es;
	sb->s_magic = le16_to_cpu(es->s_magic);
3444 3445
	if (sb->s_magic != EXT4_SUPER_MAGIC)
		goto cantfind_ext4;
T
Theodore Ts'o 已提交
3446
	sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3447

3448 3449 3450 3451 3452 3453 3454
	/* Warn if metadata_csum and gdt_csum are both set. */
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
	    EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
		ext4_warning(sb, KERN_INFO "metadata_csum and uninit_bg are "
			     "redundant flags; please run fsck.");

3455 3456 3457 3458 3459 3460 3461 3462
	/* Check for a known checksum algorithm */
	if (!ext4_verify_csum_type(sb, es)) {
		ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
			 "unknown checksum algorithm.");
		silent = 1;
		goto cantfind_ext4;
	}

3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474
	/* Load the checksum driver */
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
		sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
		if (IS_ERR(sbi->s_chksum_driver)) {
			ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
			ret = PTR_ERR(sbi->s_chksum_driver);
			sbi->s_chksum_driver = NULL;
			goto failed_mount;
		}
	}

3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487 3488
	/* Check superblock checksum */
	if (!ext4_superblock_csum_verify(sb, es)) {
		ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
			 "invalid superblock checksum.  Run e2fsck?");
		silent = 1;
		goto cantfind_ext4;
	}

	/* Precompute checksum seed for all metadata */
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
			EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
		sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
					       sizeof(es->s_uuid));

3489 3490
	/* Set defaults before we parse the mount options */
	def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
3491
	set_opt(sb, INIT_INODE_TABLE);
3492
	if (def_mount_opts & EXT4_DEFM_DEBUG)
3493
		set_opt(sb, DEBUG);
3494
	if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
3495
		set_opt(sb, GRPID);
3496
	if (def_mount_opts & EXT4_DEFM_UID16)
3497
		set_opt(sb, NO_UID32);
3498 3499
	/* xattr user namespace & acls are now defaulted on */
	set_opt(sb, XATTR_USER);
T
Theodore Ts'o 已提交
3500
#ifdef CONFIG_EXT4_FS_POSIX_ACL
3501
	set_opt(sb, POSIX_ACL);
3502
#endif
3503
	if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
3504
		set_opt(sb, JOURNAL_DATA);
3505
	else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
3506
		set_opt(sb, ORDERED_DATA);
3507
	else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
3508
		set_opt(sb, WRITEBACK_DATA);
3509 3510

	if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
3511
		set_opt(sb, ERRORS_PANIC);
3512
	else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
3513
		set_opt(sb, ERRORS_CONT);
3514
	else
3515
		set_opt(sb, ERRORS_RO);
3516
	if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
3517
		set_opt(sb, BLOCK_VALIDITY);
3518
	if (def_mount_opts & EXT4_DEFM_DISCARD)
3519
		set_opt(sb, DISCARD);
3520

3521 3522
	sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
	sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
3523 3524 3525
	sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
	sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
	sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
3526

3527
	if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
3528
		set_opt(sb, BARRIER);
3529

3530 3531 3532 3533
	/*
	 * enable delayed allocation by default
	 * Use -o nodelalloc to turn it off
	 */
3534
	if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
3535
	    ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
3536
		set_opt(sb, DELALLOC);
3537

3538 3539 3540 3541 3542 3543
	/*
	 * set default s_li_wait_mult for lazyinit, for the case there is
	 * no mount option specified.
	 */
	sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;

3544
	if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
3545
			   &journal_devnum, &journal_ioprio, 0)) {
3546 3547 3548 3549
		ext4_msg(sb, KERN_WARNING,
			 "failed to parse options in superblock: %s",
			 sbi->s_es->s_mount_opts);
	}
3550
	sbi->s_def_mount_opt = sbi->s_mount_opt;
3551
	if (!parse_options((char *) data, sb, &journal_devnum,
3552
			   &journal_ioprio, 0))
3553 3554
		goto failed_mount;

3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565
	if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
		printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
			    "with data=journal disables delayed "
			    "allocation and O_DIRECT support!\n");
		if (test_opt2(sb, EXPLICIT_DELALLOC)) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
				 "both data=journal and delalloc");
			goto failed_mount;
		}
		if (test_opt(sb, DIOREAD_NOLOCK)) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
3566
				 "both data=journal and dioread_nolock");
3567 3568 3569 3570 3571 3572
			goto failed_mount;
		}
		if (test_opt(sb, DELALLOC))
			clear_opt(sb, DELALLOC);
	}

3573
	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3574
		(test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
3575

3576 3577 3578 3579
	if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
	    (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
	     EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
	     EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
3580 3581 3582
		ext4_msg(sb, KERN_WARNING,
		       "feature flags set on rev 0 fs, "
		       "running e2fsck is recommended");
3583

3584 3585 3586 3587 3588 3589 3590 3591 3592 3593
	if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
		set_opt2(sb, HURD_COMPAT);
		if (EXT4_HAS_INCOMPAT_FEATURE(sb,
					      EXT4_FEATURE_INCOMPAT_64BIT)) {
			ext4_msg(sb, KERN_ERR,
				 "The Hurd can't support 64-bit file systems");
			goto failed_mount;
		}
	}

3594 3595 3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615
	if (IS_EXT2_SB(sb)) {
		if (ext2_feature_set_ok(sb))
			ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
				 "using the ext4 subsystem");
		else {
			ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
				 "to feature incompatibilities");
			goto failed_mount;
		}
	}

	if (IS_EXT3_SB(sb)) {
		if (ext3_feature_set_ok(sb))
			ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
				 "using the ext4 subsystem");
		else {
			ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
				 "to feature incompatibilities");
			goto failed_mount;
		}
	}

3616 3617 3618 3619 3620
	/*
	 * Check feature flags regardless of the revision level, since we
	 * previously didn't change the revision level when setting the flags,
	 * so there is a chance incompat flags are set on a rev 0 filesystem.
	 */
3621
	if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
3622
		goto failed_mount;
3623

J
Jan Kara 已提交
3624
	blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3625 3626
	if (blocksize < EXT4_MIN_BLOCK_SIZE ||
	    blocksize > EXT4_MAX_BLOCK_SIZE) {
3627 3628
		ext4_msg(sb, KERN_ERR,
		       "Unsupported filesystem blocksize %d", blocksize);
3629 3630 3631 3632
		goto failed_mount;
	}

	if (sb->s_blocksize != blocksize) {
3633 3634
		/* Validate the filesystem blocksize */
		if (!sb_set_blocksize(sb, blocksize)) {
3635
			ext4_msg(sb, KERN_ERR, "bad block size %d",
3636
					blocksize);
3637 3638 3639
			goto failed_mount;
		}

3640
		brelse(bh);
3641 3642 3643
		logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
		offset = do_div(logical_sb_block, blocksize);
		bh = sb_bread(sb, logical_sb_block);
3644
		if (!bh) {
3645 3646
			ext4_msg(sb, KERN_ERR,
			       "Can't read superblock on 2nd try");
3647 3648
			goto failed_mount;
		}
3649
		es = (struct ext4_super_block *)(bh->b_data + offset);
3650
		sbi->s_es = es;
3651
		if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
3652 3653
			ext4_msg(sb, KERN_ERR,
			       "Magic mismatch, very weird!");
3654 3655 3656 3657
			goto failed_mount;
		}
	}

3658 3659
	has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
				EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
3660 3661 3662
	sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
						      has_huge_files);
	sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
3663

3664 3665 3666
	if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
		sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
		sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
3667 3668 3669
	} else {
		sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
		sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
3670
		if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
V
Vignesh Babu 已提交
3671
		    (!is_power_of_2(sbi->s_inode_size)) ||
3672
		    (sbi->s_inode_size > blocksize)) {
3673 3674
			ext4_msg(sb, KERN_ERR,
			       "unsupported inode size: %d",
3675
			       sbi->s_inode_size);
3676 3677
			goto failed_mount;
		}
K
Kalpak Shah 已提交
3678 3679
		if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
			sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
3680
	}
3681

3682 3683
	sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
3684
		if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
3685
		    sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
V
vignesh babu 已提交
3686
		    !is_power_of_2(sbi->s_desc_size)) {
3687 3688
			ext4_msg(sb, KERN_ERR,
			       "unsupported descriptor size %lu",
3689 3690 3691 3692 3693
			       sbi->s_desc_size);
			goto failed_mount;
		}
	} else
		sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
3694

3695 3696
	sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
	sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
3697
	if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
3698
		goto cantfind_ext4;
3699

3700
	sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
3701
	if (sbi->s_inodes_per_block == 0)
3702
		goto cantfind_ext4;
3703 3704
	sbi->s_itb_per_group = sbi->s_inodes_per_group /
					sbi->s_inodes_per_block;
3705
	sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
3706 3707
	sbi->s_sbh = bh;
	sbi->s_mount_state = le16_to_cpu(es->s_state);
3708 3709
	sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
	sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
3710

3711
	for (i = 0; i < 4; i++)
3712 3713
		sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
	sbi->s_def_hash_version = es->s_def_hash_version;
3714 3715 3716 3717 3718
	if (EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_DIR_INDEX)) {
		i = le32_to_cpu(es->s_flags);
		if (i & EXT2_FLAGS_UNSIGNED_HASH)
			sbi->s_hash_unsigned = 3;
		else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3719
#ifdef __CHAR_UNSIGNED__
3720 3721 3722 3723
			if (!(sb->s_flags & MS_RDONLY))
				es->s_flags |=
					cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
			sbi->s_hash_unsigned = 3;
3724
#else
3725 3726 3727
			if (!(sb->s_flags & MS_RDONLY))
				es->s_flags |=
					cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3728
#endif
3729
		}
3730
	}
3731

3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775
	/* Handle clustersize */
	clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
	has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
				EXT4_FEATURE_RO_COMPAT_BIGALLOC);
	if (has_bigalloc) {
		if (clustersize < blocksize) {
			ext4_msg(sb, KERN_ERR,
				 "cluster size (%d) smaller than "
				 "block size (%d)", clustersize, blocksize);
			goto failed_mount;
		}
		sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
			le32_to_cpu(es->s_log_block_size);
		sbi->s_clusters_per_group =
			le32_to_cpu(es->s_clusters_per_group);
		if (sbi->s_clusters_per_group > blocksize * 8) {
			ext4_msg(sb, KERN_ERR,
				 "#clusters per group too big: %lu",
				 sbi->s_clusters_per_group);
			goto failed_mount;
		}
		if (sbi->s_blocks_per_group !=
		    (sbi->s_clusters_per_group * (clustersize / blocksize))) {
			ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
				 "clusters per group (%lu) inconsistent",
				 sbi->s_blocks_per_group,
				 sbi->s_clusters_per_group);
			goto failed_mount;
		}
	} else {
		if (clustersize != blocksize) {
			ext4_warning(sb, "fragment/cluster size (%d) != "
				     "block size (%d)", clustersize,
				     blocksize);
			clustersize = blocksize;
		}
		if (sbi->s_blocks_per_group > blocksize * 8) {
			ext4_msg(sb, KERN_ERR,
				 "#blocks per group too big: %lu",
				 sbi->s_blocks_per_group);
			goto failed_mount;
		}
		sbi->s_clusters_per_group = sbi->s_blocks_per_group;
		sbi->s_cluster_bits = 0;
3776
	}
3777 3778
	sbi->s_cluster_ratio = clustersize / blocksize;

3779
	if (sbi->s_inodes_per_group > blocksize * 8) {
3780 3781
		ext4_msg(sb, KERN_ERR,
		       "#inodes per group too big: %lu",
3782
		       sbi->s_inodes_per_group);
3783 3784 3785
		goto failed_mount;
	}

3786 3787 3788 3789
	/* Do we have standard group size of clustersize * 8 blocks ? */
	if (sbi->s_blocks_per_group == clustersize << 3)
		set_opt2(sb, STD_GROUP_SIZE);

3790 3791 3792 3793
	/*
	 * Test whether we have more sectors than will fit in sector_t,
	 * and whether the max offset is addressable by the page cache.
	 */
3794
	err = generic_check_addressable(sb->s_blocksize_bits,
3795
					ext4_blocks_count(es));
3796
	if (err) {
3797
		ext4_msg(sb, KERN_ERR, "filesystem"
3798
			 " too large to mount safely on this system");
3799
		if (sizeof(sector_t) < 8)
3800
			ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
3801 3802 3803
		goto failed_mount;
	}

3804 3805
	if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
		goto cantfind_ext4;
3806

3807 3808 3809
	/* check blocks count against device size */
	blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
	if (blocks_count && ext4_blocks_count(es) > blocks_count) {
3810 3811
		ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
		       "exceeds size of device (%llu blocks)",
3812 3813 3814 3815
		       ext4_blocks_count(es), blocks_count);
		goto failed_mount;
	}

3816 3817 3818 3819 3820
	/*
	 * It makes no sense for the first data block to be beyond the end
	 * of the filesystem.
	 */
	if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
3821
		ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
3822 3823 3824
			 "block %u is beyond end of filesystem (%llu)",
			 le32_to_cpu(es->s_first_data_block),
			 ext4_blocks_count(es));
3825 3826
		goto failed_mount;
	}
L
Laurent Vivier 已提交
3827 3828 3829 3830
	blocks_count = (ext4_blocks_count(es) -
			le32_to_cpu(es->s_first_data_block) +
			EXT4_BLOCKS_PER_GROUP(sb) - 1);
	do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
3831
	if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
3832
		ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
3833
		       "(block count %llu, first data block %u, "
3834
		       "blocks per group %lu)", sbi->s_groups_count,
3835 3836 3837 3838 3839
		       ext4_blocks_count(es),
		       le32_to_cpu(es->s_first_data_block),
		       EXT4_BLOCKS_PER_GROUP(sb));
		goto failed_mount;
	}
L
Laurent Vivier 已提交
3840
	sbi->s_groups_count = blocks_count;
3841 3842
	sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
			(EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
3843 3844
	db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
		   EXT4_DESC_PER_BLOCK(sb);
3845 3846 3847
	sbi->s_group_desc = ext4_kvmalloc(db_count *
					  sizeof(struct buffer_head *),
					  GFP_KERNEL);
3848
	if (sbi->s_group_desc == NULL) {
3849
		ext4_msg(sb, KERN_ERR, "not enough memory");
3850
		ret = -ENOMEM;
3851 3852 3853
		goto failed_mount;
	}

3854 3855
	if (ext4_proc_root)
		sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
3856

3857 3858 3859 3860
	if (sbi->s_proc)
		proc_create_data("options", S_IRUGO, sbi->s_proc,
				 &ext4_seq_options_fops, sb);

3861
	bgl_lock_init(sbi->s_blockgroup_lock);
3862 3863

	for (i = 0; i < db_count; i++) {
3864
		block = descriptor_loc(sb, logical_sb_block, i);
3865 3866
		sbi->s_group_desc[i] = sb_bread(sb, block);
		if (!sbi->s_group_desc[i]) {
3867 3868
			ext4_msg(sb, KERN_ERR,
			       "can't read group descriptor %d", i);
3869 3870 3871 3872
			db_count = i;
			goto failed_mount2;
		}
	}
3873 3874 3875 3876 3877 3878 3879 3880 3881 3882 3883 3884 3885 3886 3887 3888 3889 3890 3891 3892

	/*
	 * set up enough so that it can read an inode,
	 * and create new inode for buddy allocator
	 */
	sbi->s_gdb_count = db_count;
	if (!test_opt(sb, NOLOAD) &&
	    EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
		sb->s_op = &ext4_sops;
	else
		sb->s_op = &ext4_nojournal_sops;

	ext4_ext_init(sb);
	err = ext4_mb_init(sb);
	if (err) {
		ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
			 err);
		goto failed_mount2;
	}

3893
	if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
3894
		ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
3895
		goto failed_mount2a;
3896
	}
3897 3898
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
		if (!ext4_fill_flex_info(sb)) {
3899 3900 3901
			ext4_msg(sb, KERN_ERR,
			       "unable to initialize "
			       "flex_bg meta info!");
3902
			goto failed_mount2a;
3903 3904
		}

3905 3906 3907
	get_random_bytes(&sbi->s_next_generation, sizeof(u32));
	spin_lock_init(&sbi->s_next_gen_lock);

3908 3909 3910 3911
	init_timer(&sbi->s_err_report);
	sbi->s_err_report.function = print_daily_error_info;
	sbi->s_err_report.data = (unsigned long) sb;

3912
	/* Register extent status tree shrinker */
3913
	ext4_es_register_shrinker(sbi);
3914

3915
	err = percpu_counter_init(&sbi->s_freeclusters_counter,
3916
			ext4_count_free_clusters(sb));
3917 3918 3919 3920 3921 3922 3923 3924 3925
	if (!err) {
		err = percpu_counter_init(&sbi->s_freeinodes_counter,
				ext4_count_free_inodes(sb));
	}
	if (!err) {
		err = percpu_counter_init(&sbi->s_dirs_counter,
				ext4_count_dirs(sb));
	}
	if (!err) {
3926
		err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
3927
	}
3928 3929 3930
	if (!err) {
		err = percpu_counter_init(&sbi->s_extent_cache_cnt, 0);
	}
3931 3932 3933 3934 3935
	if (err) {
		ext4_msg(sb, KERN_ERR, "insufficient memory");
		goto failed_mount3;
	}

3936
	sbi->s_stripe = ext4_get_stripe_size(sbi);
3937
	sbi->s_extent_max_zeroout_kb = 32;
3938

3939 3940
	sb->s_export_op = &ext4_export_ops;
	sb->s_xattr = ext4_xattr_handlers;
3941
#ifdef CONFIG_QUOTA
3942
	sb->dq_op = &ext4_quota_operations;
3943
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
3944
		sb->s_qcop = &ext4_qctl_sysfile_operations;
3945 3946
	else
		sb->s_qcop = &ext4_qctl_operations;
3947
#endif
3948 3949
	memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));

3950
	INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3951
	mutex_init(&sbi->s_orphan_lock);
3952 3953 3954 3955

	sb->s_root = NULL;

	needs_recovery = (es->s_last_orphan != 0 ||
3956 3957
			  EXT4_HAS_INCOMPAT_FEATURE(sb,
				    EXT4_FEATURE_INCOMPAT_RECOVER));
3958

3959 3960 3961 3962 3963
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
	    !(sb->s_flags & MS_RDONLY))
		if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
			goto failed_mount3;

3964 3965 3966 3967 3968
	/*
	 * The first inode we look at is the journal inode.  Don't try
	 * root first: it may be modified in the journal!
	 */
	if (!test_opt(sb, NOLOAD) &&
3969 3970
	    EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
		if (ext4_load_journal(sb, es, journal_devnum))
3971
			goto failed_mount3;
3972 3973
	} else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
	      EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
3974 3975
		ext4_msg(sb, KERN_ERR, "required journal recovery "
		       "suppressed and not mounted read-only");
3976
		goto failed_mount_wq;
3977
	} else {
3978
		clear_opt(sb, DATA_FLAGS);
3979 3980 3981
		sbi->s_journal = NULL;
		needs_recovery = 0;
		goto no_journal;
3982 3983
	}

3984
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT) &&
3985 3986
	    !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
				       JBD2_FEATURE_INCOMPAT_64BIT)) {
3987
		ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
3988
		goto failed_mount_wq;
3989 3990
	}

3991 3992 3993 3994
	if (!set_journal_csum_feature_set(sb)) {
		ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
			 "feature set");
		goto failed_mount_wq;
3995
	}
3996

3997 3998 3999 4000 4001
	/* We have now updated the journal if required, so we can
	 * validate the data journaling mode. */
	switch (test_opt(sb, DATA_FLAGS)) {
	case 0:
		/* No mode set, assume a default based on the journal
A
Andrew Morton 已提交
4002 4003 4004
		 * capabilities: ORDERED_DATA if the journal can
		 * cope, else JOURNAL_DATA
		 */
4005 4006
		if (jbd2_journal_check_available_features
		    (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
4007
			set_opt(sb, ORDERED_DATA);
4008
		else
4009
			set_opt(sb, JOURNAL_DATA);
4010 4011
		break;

4012 4013
	case EXT4_MOUNT_ORDERED_DATA:
	case EXT4_MOUNT_WRITEBACK_DATA:
4014 4015
		if (!jbd2_journal_check_available_features
		    (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
4016 4017
			ext4_msg(sb, KERN_ERR, "Journal does not support "
			       "requested data journaling mode");
4018
			goto failed_mount_wq;
4019 4020 4021 4022
		}
	default:
		break;
	}
4023
	set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4024

B
Bobi Jam 已提交
4025 4026
	sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;

4027 4028 4029 4030
	/*
	 * The journal may have updated the bg summary counts, so we
	 * need to update the global counters.
	 */
4031
	percpu_counter_set(&sbi->s_freeclusters_counter,
4032
			   ext4_count_free_clusters(sb));
4033 4034 4035 4036
	percpu_counter_set(&sbi->s_freeinodes_counter,
			   ext4_count_free_inodes(sb));
	percpu_counter_set(&sbi->s_dirs_counter,
			   ext4_count_dirs(sb));
4037
	percpu_counter_set(&sbi->s_dirtyclusters_counter, 0);
4038

4039
no_journal:
4040 4041 4042 4043 4044 4045 4046 4047
	if (ext4_mballoc_ready) {
		sbi->s_mb_cache = ext4_xattr_create_cache(sb->s_id);
		if (!sbi->s_mb_cache) {
			ext4_msg(sb, KERN_ERR, "Failed to create an mb_cache");
			goto failed_mount_wq;
		}
	}

4048 4049 4050 4051 4052 4053 4054
	/*
	 * Get the # of file system overhead blocks from the
	 * superblock if present.
	 */
	if (es->s_overhead_clusters)
		sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
	else {
4055 4056
		err = ext4_calculate_overhead(sb);
		if (err)
4057 4058 4059
			goto failed_mount_wq;
	}

T
Tejun Heo 已提交
4060 4061 4062 4063
	/*
	 * The maximum number of concurrent works can be high and
	 * concurrency isn't really necessary.  Limit it to 1.
	 */
4064 4065 4066 4067
	EXT4_SB(sb)->rsv_conversion_wq =
		alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
	if (!EXT4_SB(sb)->rsv_conversion_wq) {
		printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
4068
		ret = -ENOMEM;
4069 4070 4071
		goto failed_mount4;
	}

4072
	/*
4073
	 * The jbd2_journal_load will have done any necessary log recovery,
4074 4075 4076
	 * so we can safely mount the rest of the filesystem now.
	 */

4077 4078
	root = ext4_iget(sb, EXT4_ROOT_INO);
	if (IS_ERR(root)) {
4079
		ext4_msg(sb, KERN_ERR, "get root inode failed");
4080
		ret = PTR_ERR(root);
4081
		root = NULL;
4082 4083 4084
		goto failed_mount4;
	}
	if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
4085
		ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
A
Al Viro 已提交
4086
		iput(root);
4087 4088
		goto failed_mount4;
	}
4089
	sb->s_root = d_make_root(root);
4090
	if (!sb->s_root) {
4091
		ext4_msg(sb, KERN_ERR, "get root dentry failed");
4092 4093 4094
		ret = -ENOMEM;
		goto failed_mount4;
	}
4095

4096 4097
	if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
		sb->s_flags |= MS_RDONLY;
K
Kalpak Shah 已提交
4098 4099 4100 4101 4102 4103 4104 4105 4106 4107 4108 4109 4110 4111 4112 4113 4114 4115 4116 4117 4118 4119

	/* determine the minimum size of new large inodes, if present */
	if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
		sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
						     EXT4_GOOD_OLD_INODE_SIZE;
		if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
				       EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
			if (sbi->s_want_extra_isize <
			    le16_to_cpu(es->s_want_extra_isize))
				sbi->s_want_extra_isize =
					le16_to_cpu(es->s_want_extra_isize);
			if (sbi->s_want_extra_isize <
			    le16_to_cpu(es->s_min_extra_isize))
				sbi->s_want_extra_isize =
					le16_to_cpu(es->s_min_extra_isize);
		}
	}
	/* Check if enough inode space is available */
	if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
							sbi->s_inode_size) {
		sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
						       EXT4_GOOD_OLD_INODE_SIZE;
4120 4121
		ext4_msg(sb, KERN_INFO, "required extra inode space not"
			 "available");
K
Kalpak Shah 已提交
4122 4123
	}

4124
	err = ext4_reserve_clusters(sbi, ext4_calculate_resv_clusters(sb));
L
Lukas Czerner 已提交
4125 4126
	if (err) {
		ext4_msg(sb, KERN_ERR, "failed to reserve %llu clusters for "
4127
			 "reserved pool", ext4_calculate_resv_clusters(sb));
4128
		goto failed_mount5;
L
Lukas Czerner 已提交
4129 4130
	}

4131 4132
	err = ext4_setup_system_zone(sb);
	if (err) {
4133
		ext4_msg(sb, KERN_ERR, "failed to initialize system "
4134
			 "zone (%d)", err);
4135
		goto failed_mount5;
4136 4137
	}

4138 4139
	err = ext4_register_li_request(sb, first_not_zeroed);
	if (err)
4140
		goto failed_mount6;
4141

T
Theodore Ts'o 已提交
4142 4143 4144 4145
	sbi->s_kobj.kset = ext4_kset;
	init_completion(&sbi->s_kobj_unregister);
	err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
				   "%s", sb->s_id);
4146 4147
	if (err)
		goto failed_mount7;
T
Theodore Ts'o 已提交
4148

4149 4150 4151 4152 4153 4154 4155 4156 4157 4158
#ifdef CONFIG_QUOTA
	/* Enable quota usage during mount. */
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
	    !(sb->s_flags & MS_RDONLY)) {
		err = ext4_enable_quotas(sb);
		if (err)
			goto failed_mount8;
	}
#endif  /* CONFIG_QUOTA */

4159 4160 4161
	EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
	ext4_orphan_cleanup(sb, es);
	EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
4162
	if (needs_recovery) {
4163
		ext4_msg(sb, KERN_INFO, "recovery complete");
4164 4165 4166 4167 4168 4169 4170 4171 4172 4173 4174 4175
		ext4_mark_recovery_complete(sb, es);
	}
	if (EXT4_SB(sb)->s_journal) {
		if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
			descr = " journalled data mode";
		else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
			descr = " ordered data mode";
		else
			descr = " writeback data mode";
	} else
		descr = "out journal";

4176 4177 4178 4179 4180 4181 4182 4183
	if (test_opt(sb, DISCARD)) {
		struct request_queue *q = bdev_get_queue(sb->s_bdev);
		if (!blk_queue_discard(q))
			ext4_msg(sb, KERN_WARNING,
				 "mounting with \"discard\" option, but "
				 "the device does not support discard");
	}

4184
	ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
4185 4186
		 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
		 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
4187

4188 4189
	if (es->s_error_count)
		mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
4190

4191 4192 4193 4194 4195
	/* Enable message ratelimiting. Default is 10 messages per 5 secs. */
	ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
	ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
	ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);

4196
	kfree(orig_data);
4197 4198
	return 0;

4199
cantfind_ext4:
4200
	if (!silent)
4201
		ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
4202 4203
	goto failed_mount;

4204 4205 4206 4207
#ifdef CONFIG_QUOTA
failed_mount8:
	kobject_del(&sbi->s_kobj);
#endif
4208 4209 4210 4211
failed_mount7:
	ext4_unregister_li_request(sb);
failed_mount6:
	ext4_release_system_zone(sb);
4212
failed_mount5:
A
Al Viro 已提交
4213
	dput(sb->s_root);
4214
	sb->s_root = NULL;
A
Al Viro 已提交
4215
failed_mount4:
4216
	ext4_msg(sb, KERN_ERR, "mount failed");
4217 4218
	if (EXT4_SB(sb)->rsv_conversion_wq)
		destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4219
failed_mount_wq:
4220 4221 4222 4223
	if (sbi->s_journal) {
		jbd2_journal_destroy(sbi->s_journal);
		sbi->s_journal = NULL;
	}
4224
failed_mount3:
4225
	ext4_es_unregister_shrinker(sbi);
4226
	del_timer_sync(&sbi->s_err_report);
4227 4228
	if (sbi->s_flex_groups)
		ext4_kvfree(sbi->s_flex_groups);
4229
	percpu_counter_destroy(&sbi->s_freeclusters_counter);
4230 4231
	percpu_counter_destroy(&sbi->s_freeinodes_counter);
	percpu_counter_destroy(&sbi->s_dirs_counter);
4232
	percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
4233
	percpu_counter_destroy(&sbi->s_extent_cache_cnt);
4234 4235
	if (sbi->s_mmp_tsk)
		kthread_stop(sbi->s_mmp_tsk);
4236 4237
failed_mount2a:
	ext4_mb_release(sb);
4238 4239 4240
failed_mount2:
	for (i = 0; i < db_count; i++)
		brelse(sbi->s_group_desc[i]);
4241
	ext4_kvfree(sbi->s_group_desc);
4242
failed_mount:
4243
	ext4_ext_release(sb);
4244 4245
	if (sbi->s_chksum_driver)
		crypto_free_shash(sbi->s_chksum_driver);
4246
	if (sbi->s_proc) {
4247
		remove_proc_entry("options", sbi->s_proc);
4248
		remove_proc_entry(sb->s_id, ext4_proc_root);
4249
	}
4250 4251 4252 4253
#ifdef CONFIG_QUOTA
	for (i = 0; i < MAXQUOTAS; i++)
		kfree(sbi->s_qf_names[i]);
#endif
4254
	ext4_blkdev_remove(sbi);
4255 4256 4257
	brelse(bh);
out_fail:
	sb->s_fs_info = NULL;
4258
	kfree(sbi->s_blockgroup_lock);
4259
	kfree(sbi);
4260
out_free_orig:
4261
	kfree(orig_data);
4262
	return err ? err : ret;
4263 4264 4265 4266 4267 4268 4269
}

/*
 * Setup any per-fs journal parameters now.  We'll do this both on
 * initial mount, once the journal has been initialised but before we've
 * done any recovery; and again on any subsequent remount.
 */
4270
static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
4271
{
4272
	struct ext4_sb_info *sbi = EXT4_SB(sb);
4273

4274 4275 4276
	journal->j_commit_interval = sbi->s_commit_interval;
	journal->j_min_batch_time = sbi->s_min_batch_time;
	journal->j_max_batch_time = sbi->s_max_batch_time;
4277

4278
	write_lock(&journal->j_state_lock);
4279
	if (test_opt(sb, BARRIER))
4280
		journal->j_flags |= JBD2_BARRIER;
4281
	else
4282
		journal->j_flags &= ~JBD2_BARRIER;
4283 4284 4285 4286
	if (test_opt(sb, DATA_ERR_ABORT))
		journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
	else
		journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
4287
	write_unlock(&journal->j_state_lock);
4288 4289
}

4290
static journal_t *ext4_get_journal(struct super_block *sb,
4291 4292 4293 4294 4295
				   unsigned int journal_inum)
{
	struct inode *journal_inode;
	journal_t *journal;

4296 4297
	BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));

4298 4299 4300 4301
	/* First, test for the existence of a valid inode on disk.  Bad
	 * things happen if we iget() an unused inode, as the subsequent
	 * iput() will try to delete it. */

4302 4303
	journal_inode = ext4_iget(sb, journal_inum);
	if (IS_ERR(journal_inode)) {
4304
		ext4_msg(sb, KERN_ERR, "no journal found");
4305 4306 4307 4308 4309
		return NULL;
	}
	if (!journal_inode->i_nlink) {
		make_bad_inode(journal_inode);
		iput(journal_inode);
4310
		ext4_msg(sb, KERN_ERR, "journal inode is deleted");
4311 4312 4313
		return NULL;
	}

4314
	jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4315
		  journal_inode, journal_inode->i_size);
4316
	if (!S_ISREG(journal_inode->i_mode)) {
4317
		ext4_msg(sb, KERN_ERR, "invalid journal inode");
4318 4319 4320 4321
		iput(journal_inode);
		return NULL;
	}

4322
	journal = jbd2_journal_init_inode(journal_inode);
4323
	if (!journal) {
4324
		ext4_msg(sb, KERN_ERR, "Could not load journal inode");
4325 4326 4327 4328
		iput(journal_inode);
		return NULL;
	}
	journal->j_private = sb;
4329
	ext4_init_journal_params(sb, journal);
4330 4331 4332
	return journal;
}

4333
static journal_t *ext4_get_dev_journal(struct super_block *sb,
4334 4335
				       dev_t j_dev)
{
4336
	struct buffer_head *bh;
4337
	journal_t *journal;
4338 4339
	ext4_fsblk_t start;
	ext4_fsblk_t len;
4340
	int hblock, blocksize;
4341
	ext4_fsblk_t sb_block;
4342
	unsigned long offset;
4343
	struct ext4_super_block *es;
4344 4345
	struct block_device *bdev;

4346 4347
	BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));

4348
	bdev = ext4_blkdev_get(j_dev, sb);
4349 4350 4351 4352
	if (bdev == NULL)
		return NULL;

	blocksize = sb->s_blocksize;
4353
	hblock = bdev_logical_block_size(bdev);
4354
	if (blocksize < hblock) {
4355 4356
		ext4_msg(sb, KERN_ERR,
			"blocksize too small for journal device");
4357 4358 4359
		goto out_bdev;
	}

4360 4361
	sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
	offset = EXT4_MIN_BLOCK_SIZE % blocksize;
4362 4363
	set_blocksize(bdev, blocksize);
	if (!(bh = __bread(bdev, sb_block, blocksize))) {
4364 4365
		ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
		       "external journal");
4366 4367 4368
		goto out_bdev;
	}

4369
	es = (struct ext4_super_block *) (bh->b_data + offset);
4370
	if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
4371
	    !(le32_to_cpu(es->s_feature_incompat) &
4372
	      EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
4373 4374
		ext4_msg(sb, KERN_ERR, "external journal has "
					"bad superblock");
4375 4376 4377 4378
		brelse(bh);
		goto out_bdev;
	}

4379
	if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
4380
		ext4_msg(sb, KERN_ERR, "journal UUID does not match");
4381 4382 4383 4384
		brelse(bh);
		goto out_bdev;
	}

L
Laurent Vivier 已提交
4385
	len = ext4_blocks_count(es);
4386 4387 4388
	start = sb_block + 1;
	brelse(bh);	/* we're done with the superblock */

4389
	journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
4390 4391
					start, len, blocksize);
	if (!journal) {
4392
		ext4_msg(sb, KERN_ERR, "failed to create device journal");
4393 4394 4395
		goto out_bdev;
	}
	journal->j_private = sb;
4396
	ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
4397 4398
	wait_on_buffer(journal->j_sb_buffer);
	if (!buffer_uptodate(journal->j_sb_buffer)) {
4399
		ext4_msg(sb, KERN_ERR, "I/O error on journal device");
4400 4401 4402
		goto out_journal;
	}
	if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
4403 4404
		ext4_msg(sb, KERN_ERR, "External journal has more than one "
					"user (unsupported) - %d",
4405 4406 4407
			be32_to_cpu(journal->j_superblock->s_nr_users));
		goto out_journal;
	}
4408 4409
	EXT4_SB(sb)->journal_bdev = bdev;
	ext4_init_journal_params(sb, journal);
4410
	return journal;
4411

4412
out_journal:
4413
	jbd2_journal_destroy(journal);
4414
out_bdev:
4415
	ext4_blkdev_put(bdev);
4416 4417 4418
	return NULL;
}

4419 4420
static int ext4_load_journal(struct super_block *sb,
			     struct ext4_super_block *es,
4421 4422 4423 4424 4425 4426 4427 4428
			     unsigned long journal_devnum)
{
	journal_t *journal;
	unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
	dev_t journal_dev;
	int err = 0;
	int really_read_only;

4429 4430
	BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));

4431 4432
	if (journal_devnum &&
	    journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4433 4434
		ext4_msg(sb, KERN_INFO, "external journal device major/minor "
			"numbers have changed");
4435 4436 4437 4438 4439 4440 4441 4442 4443 4444 4445
		journal_dev = new_decode_dev(journal_devnum);
	} else
		journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));

	really_read_only = bdev_read_only(sb->s_bdev);

	/*
	 * Are we loading a blank journal or performing recovery after a
	 * crash?  For recovery, we need to check in advance whether we
	 * can get read-write access to the device.
	 */
4446
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
4447
		if (sb->s_flags & MS_RDONLY) {
4448 4449
			ext4_msg(sb, KERN_INFO, "INFO: recovery "
					"required on readonly filesystem");
4450
			if (really_read_only) {
4451 4452
				ext4_msg(sb, KERN_ERR, "write access "
					"unavailable, cannot proceed");
4453 4454
				return -EROFS;
			}
4455 4456
			ext4_msg(sb, KERN_INFO, "write access will "
			       "be enabled during recovery");
4457 4458 4459 4460
		}
	}

	if (journal_inum && journal_dev) {
4461 4462
		ext4_msg(sb, KERN_ERR, "filesystem has both journal "
		       "and inode journals!");
4463 4464 4465 4466
		return -EINVAL;
	}

	if (journal_inum) {
4467
		if (!(journal = ext4_get_journal(sb, journal_inum)))
4468 4469
			return -EINVAL;
	} else {
4470
		if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
4471 4472 4473
			return -EINVAL;
	}

4474
	if (!(journal->j_flags & JBD2_BARRIER))
4475
		ext4_msg(sb, KERN_INFO, "barriers disabled");
4476

4477
	if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
4478
		err = jbd2_journal_wipe(journal, !really_read_only);
4479 4480 4481 4482 4483
	if (!err) {
		char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
		if (save)
			memcpy(save, ((char *) es) +
			       EXT4_S_ERR_START, EXT4_S_ERR_LEN);
4484
		err = jbd2_journal_load(journal);
4485 4486 4487 4488 4489
		if (save)
			memcpy(((char *) es) + EXT4_S_ERR_START,
			       save, EXT4_S_ERR_LEN);
		kfree(save);
	}
4490 4491

	if (err) {
4492
		ext4_msg(sb, KERN_ERR, "error loading journal");
4493
		jbd2_journal_destroy(journal);
4494 4495 4496
		return err;
	}

4497 4498
	EXT4_SB(sb)->s_journal = journal;
	ext4_clear_journal_err(sb, es);
4499

4500
	if (!really_read_only && journal_devnum &&
4501 4502 4503 4504
	    journal_devnum != le32_to_cpu(es->s_journal_dev)) {
		es->s_journal_dev = cpu_to_le32(journal_devnum);

		/* Make sure we flush the recovery flag to disk. */
4505
		ext4_commit_super(sb, 1);
4506 4507 4508 4509 4510
	}

	return 0;
}

4511
static int ext4_commit_super(struct super_block *sb, int sync)
4512
{
4513
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;
4514
	struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
4515
	int error = 0;
4516

4517
	if (!sbh || block_device_ejected(sb))
4518
		return error;
4519 4520 4521 4522 4523 4524 4525 4526 4527
	if (buffer_write_io_error(sbh)) {
		/*
		 * Oh, dear.  A previous attempt to write the
		 * superblock failed.  This could happen because the
		 * USB device was yanked out.  Or it could happen to
		 * be a transient write error and maybe the block will
		 * be remapped.  Nothing we can do but to retry the
		 * write and hope for the best.
		 */
4528 4529
		ext4_msg(sb, KERN_ERR, "previous I/O error to "
		       "superblock detected");
4530 4531 4532
		clear_buffer_write_io_error(sbh);
		set_buffer_uptodate(sbh);
	}
4533 4534 4535 4536 4537 4538 4539 4540 4541 4542 4543 4544
	/*
	 * If the file system is mounted read-only, don't update the
	 * superblock write time.  This avoids updating the superblock
	 * write time when we are mounting the root file system
	 * read/only but we need to replay the journal; at that point,
	 * for people who are east of GMT and who make their clock
	 * tick in localtime for Windows bug-for-bug compatibility,
	 * the clock is set in the future, and this will cause e2fsck
	 * to complain and force a full file system check.
	 */
	if (!(sb->s_flags & MS_RDONLY))
		es->s_wtime = cpu_to_le32(get_seconds());
4545 4546 4547
	if (sb->s_bdev->bd_part)
		es->s_kbytes_written =
			cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
T
Theodore Ts'o 已提交
4548 4549
			    ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
			      EXT4_SB(sb)->s_sectors_written_start) >> 1));
4550 4551 4552
	else
		es->s_kbytes_written =
			cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
4553 4554 4555
	ext4_free_blocks_count_set(es,
			EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
				&EXT4_SB(sb)->s_freeclusters_counter)));
4556 4557 4558
	es->s_free_inodes_count =
		cpu_to_le32(percpu_counter_sum_positive(
				&EXT4_SB(sb)->s_freeinodes_counter));
4559
	BUFFER_TRACE(sbh, "marking dirty");
4560
	ext4_superblock_csum_set(sb);
4561
	mark_buffer_dirty(sbh);
4562
	if (sync) {
4563 4564 4565 4566 4567 4568
		error = sync_dirty_buffer(sbh);
		if (error)
			return error;

		error = buffer_write_io_error(sbh);
		if (error) {
4569 4570
			ext4_msg(sb, KERN_ERR, "I/O error while writing "
			       "superblock");
4571 4572 4573 4574
			clear_buffer_write_io_error(sbh);
			set_buffer_uptodate(sbh);
		}
	}
4575
	return error;
4576 4577 4578 4579 4580 4581 4582
}

/*
 * Have we just finished recovery?  If so, and if we are mounting (or
 * remounting) the filesystem readonly, then we will end up with a
 * consistent fs on disk.  Record that fact.
 */
4583 4584
static void ext4_mark_recovery_complete(struct super_block *sb,
					struct ext4_super_block *es)
4585
{
4586
	journal_t *journal = EXT4_SB(sb)->s_journal;
4587

4588 4589 4590 4591
	if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
		BUG_ON(journal != NULL);
		return;
	}
4592
	jbd2_journal_lock_updates(journal);
4593 4594 4595
	if (jbd2_journal_flush(journal) < 0)
		goto out;

4596
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
4597
	    sb->s_flags & MS_RDONLY) {
4598
		EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4599
		ext4_commit_super(sb, 1);
4600
	}
4601 4602

out:
4603
	jbd2_journal_unlock_updates(journal);
4604 4605 4606 4607 4608 4609 4610
}

/*
 * If we are mounting (or read-write remounting) a filesystem whose journal
 * has recorded an error from a previous lifetime, move that error to the
 * main filesystem now.
 */
4611 4612
static void ext4_clear_journal_err(struct super_block *sb,
				   struct ext4_super_block *es)
4613 4614 4615 4616 4617
{
	journal_t *journal;
	int j_errno;
	const char *errstr;

4618 4619
	BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));

4620
	journal = EXT4_SB(sb)->s_journal;
4621 4622 4623

	/*
	 * Now check for any error status which may have been recorded in the
4624
	 * journal by a prior ext4_error() or ext4_abort()
4625 4626
	 */

4627
	j_errno = jbd2_journal_errno(journal);
4628 4629 4630
	if (j_errno) {
		char nbuf[16];

4631
		errstr = ext4_decode_error(sb, j_errno, nbuf);
4632
		ext4_warning(sb, "Filesystem error recorded "
4633
			     "from previous mount: %s", errstr);
4634
		ext4_warning(sb, "Marking fs in need of filesystem check.");
4635

4636 4637
		EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
		es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
4638
		ext4_commit_super(sb, 1);
4639

4640
		jbd2_journal_clear_err(journal);
4641
		jbd2_journal_update_sb_errno(journal);
4642 4643 4644 4645 4646 4647 4648
	}
}

/*
 * Force the running and committing transactions to commit,
 * and wait on the commit.
 */
4649
int ext4_force_commit(struct super_block *sb)
4650 4651 4652 4653 4654 4655
{
	journal_t *journal;

	if (sb->s_flags & MS_RDONLY)
		return 0;

4656
	journal = EXT4_SB(sb)->s_journal;
4657
	return ext4_journal_force_commit(journal);
4658 4659
}

4660
static int ext4_sync_fs(struct super_block *sb, int wait)
4661
{
4662
	int ret = 0;
4663
	tid_t target;
4664
	bool needs_barrier = false;
4665
	struct ext4_sb_info *sbi = EXT4_SB(sb);
4666

4667
	trace_ext4_sync_fs(sb, wait);
4668
	flush_workqueue(sbi->rsv_conversion_wq);
4669 4670 4671 4672 4673
	/*
	 * Writeback quota in non-journalled quota case - journalled quota has
	 * no dirty dquots
	 */
	dquot_writeback_dquots(sb, -1);
4674 4675 4676 4677 4678 4679 4680 4681 4682 4683
	/*
	 * Data writeback is possible w/o journal transaction, so barrier must
	 * being sent at the end of the function. But we can skip it if
	 * transaction_commit will do it for us.
	 */
	target = jbd2_get_latest_transaction(sbi->s_journal);
	if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
	    !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
		needs_barrier = true;

4684
	if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4685
		if (wait)
4686 4687 4688 4689 4690 4691 4692
			ret = jbd2_log_wait_commit(sbi->s_journal, target);
	}
	if (needs_barrier) {
		int err;
		err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
		if (!ret)
			ret = err;
4693
	}
4694 4695 4696 4697 4698 4699 4700 4701 4702 4703 4704 4705 4706 4707

	return ret;
}

static int ext4_sync_fs_nojournal(struct super_block *sb, int wait)
{
	int ret = 0;

	trace_ext4_sync_fs(sb, wait);
	flush_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
	dquot_writeback_dquots(sb, -1);
	if (wait && test_opt(sb, BARRIER))
		ret = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);

4708
	return ret;
4709 4710 4711 4712 4713
}

/*
 * LVM calls this function before a (read-only) snapshot is created.  This
 * gives us a chance to flush the journal completely and mark the fs clean.
4714 4715
 *
 * Note that only this function cannot bring a filesystem to be in a clean
4716 4717
 * state independently. It relies on upper layer to stop all data & metadata
 * modifications.
4718
 */
4719
static int ext4_freeze(struct super_block *sb)
4720
{
4721 4722
	int error = 0;
	journal_t *journal;
4723

4724 4725
	if (sb->s_flags & MS_RDONLY)
		return 0;
4726

4727
	journal = EXT4_SB(sb)->s_journal;
4728

4729 4730
	/* Now we set up the journal barrier. */
	jbd2_journal_lock_updates(journal);
4731

4732 4733 4734 4735 4736
	/*
	 * Don't clear the needs_recovery flag if we failed to flush
	 * the journal.
	 */
	error = jbd2_journal_flush(journal);
4737 4738
	if (error < 0)
		goto out;
4739 4740 4741 4742

	/* Journal blocked and flushed, clear needs_recovery flag. */
	EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
	error = ext4_commit_super(sb, 1);
4743
out:
4744
	/* we rely on upper layer to stop further updates */
4745 4746
	jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
	return error;
4747 4748 4749 4750 4751 4752
}

/*
 * Called by LVM after the snapshot is done.  We need to reset the RECOVER
 * flag here, even though the filesystem is not technically dirty yet.
 */
4753
static int ext4_unfreeze(struct super_block *sb)
4754
{
4755 4756 4757 4758 4759 4760
	if (sb->s_flags & MS_RDONLY)
		return 0;

	/* Reset the needs_recovery flag before the fs is unlocked. */
	EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
	ext4_commit_super(sb, 1);
4761
	return 0;
4762 4763
}

4764 4765 4766 4767 4768
/*
 * Structure to save mount options for ext4_remount's benefit
 */
struct ext4_mount_options {
	unsigned long s_mount_opt;
4769
	unsigned long s_mount_opt2;
4770 4771
	kuid_t s_resuid;
	kgid_t s_resgid;
4772 4773 4774 4775 4776 4777 4778 4779
	unsigned long s_commit_interval;
	u32 s_min_batch_time, s_max_batch_time;
#ifdef CONFIG_QUOTA
	int s_jquota_fmt;
	char *s_qf_names[MAXQUOTAS];
#endif
};

4780
static int ext4_remount(struct super_block *sb, int *flags, char *data)
4781
{
4782
	struct ext4_super_block *es;
4783
	struct ext4_sb_info *sbi = EXT4_SB(sb);
4784
	unsigned long old_sb_flags;
4785
	struct ext4_mount_options old_opts;
4786
	int enable_quota = 0;
4787
	ext4_group_t g;
4788
	unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
4789
	int err = 0;
4790
#ifdef CONFIG_QUOTA
4791
	int i, j;
4792
#endif
4793
	char *orig_data = kstrdup(data, GFP_KERNEL);
4794 4795 4796 4797

	/* Store the original options */
	old_sb_flags = sb->s_flags;
	old_opts.s_mount_opt = sbi->s_mount_opt;
4798
	old_opts.s_mount_opt2 = sbi->s_mount_opt2;
4799 4800 4801
	old_opts.s_resuid = sbi->s_resuid;
	old_opts.s_resgid = sbi->s_resgid;
	old_opts.s_commit_interval = sbi->s_commit_interval;
4802 4803
	old_opts.s_min_batch_time = sbi->s_min_batch_time;
	old_opts.s_max_batch_time = sbi->s_max_batch_time;
4804 4805 4806
#ifdef CONFIG_QUOTA
	old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
	for (i = 0; i < MAXQUOTAS; i++)
4807 4808 4809 4810 4811 4812
		if (sbi->s_qf_names[i]) {
			old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
							 GFP_KERNEL);
			if (!old_opts.s_qf_names[i]) {
				for (j = 0; j < i; j++)
					kfree(old_opts.s_qf_names[j]);
4813
				kfree(orig_data);
4814 4815 4816 4817
				return -ENOMEM;
			}
		} else
			old_opts.s_qf_names[i] = NULL;
4818
#endif
4819 4820
	if (sbi->s_journal && sbi->s_journal->j_task->io_context)
		journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
4821 4822 4823 4824

	/*
	 * Allow the "check" option to be passed as a remount option.
	 */
4825
	if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
4826 4827 4828 4829
		err = -EINVAL;
		goto restore_opts;
	}

4830 4831 4832 4833 4834 4835 4836 4837 4838 4839 4840 4841 4842 4843 4844
	if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
		if (test_opt2(sb, EXPLICIT_DELALLOC)) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
				 "both data=journal and delalloc");
			err = -EINVAL;
			goto restore_opts;
		}
		if (test_opt(sb, DIOREAD_NOLOCK)) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
				 "both data=journal and dioread_nolock");
			err = -EINVAL;
			goto restore_opts;
		}
	}

4845
	if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
4846
		ext4_abort(sb, "Abort forced by user");
4847 4848

	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
4849
		(test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
4850 4851 4852

	es = sbi->s_es;

4853
	if (sbi->s_journal) {
4854
		ext4_init_journal_params(sb, sbi->s_journal);
4855 4856
		set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
	}
4857

4858
	if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4859
		if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
4860 4861 4862 4863 4864
			err = -EROFS;
			goto restore_opts;
		}

		if (*flags & MS_RDONLY) {
4865 4866 4867
			err = sync_filesystem(sb);
			if (err < 0)
				goto restore_opts;
4868 4869
			err = dquot_suspend(sb, -1);
			if (err < 0)
4870 4871
				goto restore_opts;

4872 4873 4874 4875 4876 4877 4878 4879 4880 4881 4882
			/*
			 * First of all, the unconditional stuff we have to do
			 * to disable replay of the journal when we next remount
			 */
			sb->s_flags |= MS_RDONLY;

			/*
			 * OK, test if we are remounting a valid rw partition
			 * readonly, and if so set the rdonly flag and then
			 * mark the partition as valid again.
			 */
4883 4884
			if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
			    (sbi->s_mount_state & EXT4_VALID_FS))
4885 4886
				es->s_state = cpu_to_le16(sbi->s_mount_state);

4887
			if (sbi->s_journal)
4888
				ext4_mark_recovery_complete(sb, es);
4889
		} else {
4890 4891
			/* Make sure we can mount this feature set readwrite */
			if (!ext4_feature_set_ok(sb, 0)) {
4892 4893 4894
				err = -EROFS;
				goto restore_opts;
			}
4895 4896
			/*
			 * Make sure the group descriptor checksums
4897
			 * are sane.  If they aren't, refuse to remount r/w.
4898 4899 4900 4901 4902
			 */
			for (g = 0; g < sbi->s_groups_count; g++) {
				struct ext4_group_desc *gdp =
					ext4_get_group_desc(sb, g, NULL);

4903
				if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
4904 4905
					ext4_msg(sb, KERN_ERR,
	       "ext4_remount: Checksum for group %u failed (%u!=%u)",
4906 4907 4908 4909 4910 4911 4912
		g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
					       le16_to_cpu(gdp->bg_checksum));
					err = -EINVAL;
					goto restore_opts;
				}
			}

4913 4914 4915 4916 4917 4918
			/*
			 * If we have an unprocessed orphan list hanging
			 * around from a previously readonly bdev mount,
			 * require a full umount/remount for now.
			 */
			if (es->s_last_orphan) {
4919
				ext4_msg(sb, KERN_WARNING, "Couldn't "
4920 4921
				       "remount RDWR because of unprocessed "
				       "orphan inode list.  Please "
4922
				       "umount/remount instead");
4923 4924 4925 4926
				err = -EINVAL;
				goto restore_opts;
			}

4927 4928 4929 4930 4931 4932
			/*
			 * Mounting a RDONLY partition read-write, so reread
			 * and store the current valid flag.  (It may have
			 * been changed by e2fsck since we originally mounted
			 * the partition.)
			 */
4933 4934
			if (sbi->s_journal)
				ext4_clear_journal_err(sb, es);
4935
			sbi->s_mount_state = le16_to_cpu(es->s_state);
4936
			if (!ext4_setup_super(sb, es, 0))
4937
				sb->s_flags &= ~MS_RDONLY;
4938 4939 4940 4941 4942 4943 4944
			if (EXT4_HAS_INCOMPAT_FEATURE(sb,
						     EXT4_FEATURE_INCOMPAT_MMP))
				if (ext4_multi_mount_protect(sb,
						le64_to_cpu(es->s_mmp_block))) {
					err = -EROFS;
					goto restore_opts;
				}
4945
			enable_quota = 1;
4946 4947
		}
	}
4948 4949 4950 4951 4952 4953 4954 4955 4956 4957 4958 4959 4960

	/*
	 * Reinitialize lazy itable initialization thread based on
	 * current settings
	 */
	if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
		ext4_unregister_li_request(sb);
	else {
		ext4_group_t first_not_zeroed;
		first_not_zeroed = ext4_has_uninit_itable(sb);
		ext4_register_li_request(sb, first_not_zeroed);
	}

4961
	ext4_setup_system_zone(sb);
4962
	if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
4963
		ext4_commit_super(sb, 1);
4964

4965 4966 4967
#ifdef CONFIG_QUOTA
	/* Release old quota file names */
	for (i = 0; i < MAXQUOTAS; i++)
4968
		kfree(old_opts.s_qf_names[i]);
4969 4970 4971 4972 4973 4974
	if (enable_quota) {
		if (sb_any_quota_suspended(sb))
			dquot_resume(sb, -1);
		else if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
					EXT4_FEATURE_RO_COMPAT_QUOTA)) {
			err = ext4_enable_quotas(sb);
4975
			if (err)
4976 4977 4978
				goto restore_opts;
		}
	}
4979
#endif
4980 4981 4982

	ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
	kfree(orig_data);
4983
	return 0;
4984

4985 4986 4987
restore_opts:
	sb->s_flags = old_sb_flags;
	sbi->s_mount_opt = old_opts.s_mount_opt;
4988
	sbi->s_mount_opt2 = old_opts.s_mount_opt2;
4989 4990 4991
	sbi->s_resuid = old_opts.s_resuid;
	sbi->s_resgid = old_opts.s_resgid;
	sbi->s_commit_interval = old_opts.s_commit_interval;
4992 4993
	sbi->s_min_batch_time = old_opts.s_min_batch_time;
	sbi->s_max_batch_time = old_opts.s_max_batch_time;
4994 4995 4996
#ifdef CONFIG_QUOTA
	sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
	for (i = 0; i < MAXQUOTAS; i++) {
4997
		kfree(sbi->s_qf_names[i]);
4998 4999 5000
		sbi->s_qf_names[i] = old_opts.s_qf_names[i];
	}
#endif
5001
	kfree(orig_data);
5002 5003 5004
	return err;
}

5005
static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
5006 5007
{
	struct super_block *sb = dentry->d_sb;
5008 5009
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
L
Lukas Czerner 已提交
5010
	ext4_fsblk_t overhead = 0, resv_blocks;
P
Pekka Enberg 已提交
5011
	u64 fsid;
5012
	s64 bfree;
L
Lukas Czerner 已提交
5013
	resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
5014

5015 5016
	if (!test_opt(sb, MINIX_DF))
		overhead = sbi->s_overhead;
5017

5018
	buf->f_type = EXT4_SUPER_MAGIC;
5019
	buf->f_bsize = sb->s_blocksize;
5020
	buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
5021 5022
	bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
		percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
5023
	/* prevent underflow in case that few free space is available */
5024
	buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
L
Lukas Czerner 已提交
5025 5026 5027
	buf->f_bavail = buf->f_bfree -
			(ext4_r_blocks_count(es) + resv_blocks);
	if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
5028 5029
		buf->f_bavail = 0;
	buf->f_files = le32_to_cpu(es->s_inodes_count);
P
Peter Zijlstra 已提交
5030
	buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
5031
	buf->f_namelen = EXT4_NAME_LEN;
P
Pekka Enberg 已提交
5032 5033 5034 5035
	fsid = le64_to_cpup((void *)es->s_uuid) ^
	       le64_to_cpup((void *)es->s_uuid + sizeof(u64));
	buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
	buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
5036

5037 5038 5039
	return 0;
}

5040 5041
/* Helper function for writing quotas on sync - we need to start transaction
 * before quota file is locked for write. Otherwise the are possible deadlocks:
5042
 * Process 1                         Process 2
5043
 * ext4_create()                     quota_sync()
5044
 *   jbd2_journal_start()                  write_dquot()
5045
 *   dquot_initialize()                         down(dqio_mutex)
5046
 *     down(dqio_mutex)                    jbd2_journal_start()
5047 5048 5049 5050 5051 5052 5053
 *
 */

#ifdef CONFIG_QUOTA

static inline struct inode *dquot_to_inode(struct dquot *dquot)
{
5054
	return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
5055 5056
}

5057
static int ext4_write_dquot(struct dquot *dquot)
5058 5059 5060 5061 5062 5063
{
	int ret, err;
	handle_t *handle;
	struct inode *inode;

	inode = dquot_to_inode(dquot);
5064
	handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
5065
				    EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
5066 5067 5068
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_commit(dquot);
5069
	err = ext4_journal_stop(handle);
5070 5071 5072 5073 5074
	if (!ret)
		ret = err;
	return ret;
}

5075
static int ext4_acquire_dquot(struct dquot *dquot)
5076 5077 5078 5079
{
	int ret, err;
	handle_t *handle;

5080
	handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
5081
				    EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
5082 5083 5084
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_acquire(dquot);
5085
	err = ext4_journal_stop(handle);
5086 5087 5088 5089 5090
	if (!ret)
		ret = err;
	return ret;
}

5091
static int ext4_release_dquot(struct dquot *dquot)
5092 5093 5094 5095
{
	int ret, err;
	handle_t *handle;

5096
	handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
5097
				    EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
J
Jan Kara 已提交
5098 5099 5100
	if (IS_ERR(handle)) {
		/* Release dquot anyway to avoid endless cycle in dqput() */
		dquot_release(dquot);
5101
		return PTR_ERR(handle);
J
Jan Kara 已提交
5102
	}
5103
	ret = dquot_release(dquot);
5104
	err = ext4_journal_stop(handle);
5105 5106 5107 5108 5109
	if (!ret)
		ret = err;
	return ret;
}

5110
static int ext4_mark_dquot_dirty(struct dquot *dquot)
5111
{
5112 5113 5114
	struct super_block *sb = dquot->dq_sb;
	struct ext4_sb_info *sbi = EXT4_SB(sb);

5115
	/* Are we journaling quotas? */
5116 5117
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) ||
	    sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
5118
		dquot_mark_dquot_dirty(dquot);
5119
		return ext4_write_dquot(dquot);
5120 5121 5122 5123 5124
	} else {
		return dquot_mark_dquot_dirty(dquot);
	}
}

5125
static int ext4_write_info(struct super_block *sb, int type)
5126 5127 5128 5129 5130
{
	int ret, err;
	handle_t *handle;

	/* Data block + inode block */
5131
	handle = ext4_journal_start(sb->s_root->d_inode, EXT4_HT_QUOTA, 2);
5132 5133 5134
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_commit_info(sb, type);
5135
	err = ext4_journal_stop(handle);
5136 5137 5138 5139 5140 5141 5142 5143 5144
	if (!ret)
		ret = err;
	return ret;
}

/*
 * Turn on quotas during mount time - we need to find
 * the quota file and such...
 */
5145
static int ext4_quota_on_mount(struct super_block *sb, int type)
5146
{
5147 5148
	return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
					EXT4_SB(sb)->s_jquota_fmt, type);
5149 5150 5151 5152 5153
}

/*
 * Standard function to be called on quota_on
 */
5154
static int ext4_quota_on(struct super_block *sb, int type, int format_id,
5155
			 struct path *path)
5156 5157 5158 5159 5160
{
	int err;

	if (!test_opt(sb, QUOTA))
		return -EINVAL;
5161

5162
	/* Quotafile not on the same filesystem? */
5163
	if (path->dentry->d_sb != sb)
5164
		return -EXDEV;
5165 5166
	/* Journaling quota? */
	if (EXT4_SB(sb)->s_qf_names[type]) {
5167
		/* Quotafile not in fs root? */
5168
		if (path->dentry->d_parent != sb->s_root)
5169 5170 5171
			ext4_msg(sb, KERN_WARNING,
				"Quota file not on filesystem root. "
				"Journaled quota will not work");
5172
	}
5173 5174 5175 5176 5177

	/*
	 * When we journal data on quota file, we have to flush journal to see
	 * all updates to the file when we bypass pagecache...
	 */
5178
	if (EXT4_SB(sb)->s_journal &&
5179
	    ext4_should_journal_data(path->dentry->d_inode)) {
5180 5181 5182 5183 5184
		/*
		 * We don't need to lock updates but journal_flush() could
		 * otherwise be livelocked...
		 */
		jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
5185
		err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
5186
		jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
5187
		if (err)
5188
			return err;
5189 5190
	}

5191
	return dquot_quota_on(sb, type, format_id, path);
5192 5193
}

5194 5195 5196 5197 5198 5199 5200 5201 5202 5203 5204 5205 5206 5207 5208 5209 5210 5211 5212 5213 5214
static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
			     unsigned int flags)
{
	int err;
	struct inode *qf_inode;
	unsigned long qf_inums[MAXQUOTAS] = {
		le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
		le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
	};

	BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA));

	if (!qf_inums[type])
		return -EPERM;

	qf_inode = ext4_iget(sb, qf_inums[type]);
	if (IS_ERR(qf_inode)) {
		ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
		return PTR_ERR(qf_inode);
	}

J
Jan Kara 已提交
5215 5216
	/* Don't account quota for quota files to avoid recursion */
	qf_inode->i_flags |= S_NOQUOTA;
5217 5218 5219 5220 5221 5222 5223 5224 5225 5226 5227 5228 5229 5230 5231 5232 5233 5234 5235 5236 5237 5238
	err = dquot_enable(qf_inode, type, format_id, flags);
	iput(qf_inode);

	return err;
}

/* Enable usage tracking for all quota types. */
static int ext4_enable_quotas(struct super_block *sb)
{
	int type, err = 0;
	unsigned long qf_inums[MAXQUOTAS] = {
		le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
		le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
	};

	sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
	for (type = 0; type < MAXQUOTAS; type++) {
		if (qf_inums[type]) {
			err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
						DQUOT_USAGE_ENABLED);
			if (err) {
				ext4_warning(sb,
5239 5240 5241
					"Failed to enable quota tracking "
					"(type=%d, err=%d). Please run "
					"e2fsck to fix.", type, err);
5242 5243 5244 5245 5246 5247 5248 5249 5250 5251 5252 5253 5254 5255 5256 5257 5258 5259 5260 5261 5262 5263
				return err;
			}
		}
	}
	return 0;
}

/*
 * quota_on function that is used when QUOTA feature is set.
 */
static int ext4_quota_on_sysfile(struct super_block *sb, int type,
				 int format_id)
{
	if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
		return -EINVAL;

	/*
	 * USAGE was enabled at mount time. Only need to enable LIMITS now.
	 */
	return ext4_quota_enable(sb, type, format_id, DQUOT_LIMITS_ENABLED);
}

5264 5265
static int ext4_quota_off(struct super_block *sb, int type)
{
5266 5267 5268
	struct inode *inode = sb_dqopt(sb)->files[type];
	handle_t *handle;

5269 5270 5271
	/* Force all delayed allocation blocks to be allocated.
	 * Caller already holds s_umount sem */
	if (test_opt(sb, DELALLOC))
5272 5273
		sync_filesystem(sb);

5274 5275 5276
	if (!inode)
		goto out;

5277 5278
	/* Update modification times of quota files when userspace can
	 * start looking at them */
5279
	handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5280 5281 5282 5283 5284 5285 5286
	if (IS_ERR(handle))
		goto out;
	inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	ext4_mark_inode_dirty(handle, inode);
	ext4_journal_stop(handle);

out:
5287 5288 5289
	return dquot_quota_off(sb, type);
}

5290 5291 5292 5293 5294 5295 5296 5297 5298 5299 5300 5301
/*
 * quota_off function that is used when QUOTA feature is set.
 */
static int ext4_quota_off_sysfile(struct super_block *sb, int type)
{
	if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
		return -EINVAL;

	/* Disable only the limits. */
	return dquot_disable(sb, type, DQUOT_LIMITS_ENABLED);
}

5302 5303
/* Read data from quotafile - avoid pagecache and such because we cannot afford
 * acquiring the locks... As quota files are never truncated and quota code
L
Lucas De Marchi 已提交
5304
 * itself serializes the operations (and no one else should touch the files)
5305
 * we don't have to be afraid of races */
5306
static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
5307 5308 5309
			       size_t len, loff_t off)
{
	struct inode *inode = sb_dqopt(sb)->files[type];
A
Aneesh Kumar K.V 已提交
5310
	ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5311 5312 5313 5314 5315 5316 5317 5318 5319 5320 5321 5322 5323 5324 5325
	int err = 0;
	int offset = off & (sb->s_blocksize - 1);
	int tocopy;
	size_t toread;
	struct buffer_head *bh;
	loff_t i_size = i_size_read(inode);

	if (off > i_size)
		return 0;
	if (off+len > i_size)
		len = i_size-off;
	toread = len;
	while (toread > 0) {
		tocopy = sb->s_blocksize - offset < toread ?
				sb->s_blocksize - offset : toread;
5326
		bh = ext4_bread(NULL, inode, blk, 0, &err);
5327 5328 5329 5330 5331 5332 5333 5334 5335 5336 5337 5338 5339 5340 5341 5342 5343
		if (err)
			return err;
		if (!bh)	/* A hole? */
			memset(data, 0, tocopy);
		else
			memcpy(data, bh->b_data+offset, tocopy);
		brelse(bh);
		offset = 0;
		toread -= tocopy;
		data += tocopy;
		blk++;
	}
	return len;
}

/* Write to quotafile (we know the transaction is already started and has
 * enough credits) */
5344
static ssize_t ext4_quota_write(struct super_block *sb, int type,
5345 5346 5347
				const char *data, size_t len, loff_t off)
{
	struct inode *inode = sb_dqopt(sb)->files[type];
A
Aneesh Kumar K.V 已提交
5348
	ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5349 5350 5351 5352 5353
	int err = 0;
	int offset = off & (sb->s_blocksize - 1);
	struct buffer_head *bh;
	handle_t *handle = journal_current_handle();

5354
	if (EXT4_SB(sb)->s_journal && !handle) {
5355 5356
		ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
			" cancelled because transaction is not started",
J
Jan Kara 已提交
5357 5358 5359
			(unsigned long long)off, (unsigned long long)len);
		return -EIO;
	}
5360 5361 5362 5363 5364 5365 5366 5367 5368 5369 5370 5371 5372 5373
	/*
	 * Since we account only one data block in transaction credits,
	 * then it is impossible to cross a block boundary.
	 */
	if (sb->s_blocksize - offset < len) {
		ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
			" cancelled because not block aligned",
			(unsigned long long)off, (unsigned long long)len);
		return -EIO;
	}

	bh = ext4_bread(handle, inode, blk, 1, &err);
	if (!bh)
		goto out;
5374 5375 5376 5377
	err = ext4_journal_get_write_access(handle, bh);
	if (err) {
		brelse(bh);
		goto out;
5378
	}
5379 5380 5381 5382
	lock_buffer(bh);
	memcpy(bh->b_data+offset, data, len);
	flush_dcache_page(bh->b_page);
	unlock_buffer(bh);
5383
	err = ext4_handle_dirty_metadata(handle, NULL, bh);
5384
	brelse(bh);
5385
out:
5386
	if (err)
5387
		return err;
5388 5389
	if (inode->i_size < off + len) {
		i_size_write(inode, off + len);
5390
		EXT4_I(inode)->i_disksize = inode->i_size;
5391
		ext4_mark_inode_dirty(handle, inode);
5392
	}
5393
	return len;
5394 5395 5396 5397
}

#endif

A
Al Viro 已提交
5398 5399
static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
		       const char *dev_name, void *data)
5400
{
A
Al Viro 已提交
5401
	return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
5402 5403
}

5404
#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
5405 5406 5407 5408 5409 5410 5411 5412 5413 5414 5415 5416
static inline void register_as_ext2(void)
{
	int err = register_filesystem(&ext2_fs_type);
	if (err)
		printk(KERN_WARNING
		       "EXT4-fs: Unable to register as ext2 (%d)\n", err);
}

static inline void unregister_as_ext2(void)
{
	unregister_filesystem(&ext2_fs_type);
}
5417 5418 5419 5420 5421 5422 5423 5424 5425 5426 5427

static inline int ext2_feature_set_ok(struct super_block *sb)
{
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
		return 0;
	if (sb->s_flags & MS_RDONLY)
		return 1;
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
		return 0;
	return 1;
}
5428 5429 5430
#else
static inline void register_as_ext2(void) { }
static inline void unregister_as_ext2(void) { }
5431
static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
5432 5433
#endif

5434
#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
5435 5436 5437 5438 5439 5440 5441 5442 5443 5444 5445 5446
static inline void register_as_ext3(void)
{
	int err = register_filesystem(&ext3_fs_type);
	if (err)
		printk(KERN_WARNING
		       "EXT4-fs: Unable to register as ext3 (%d)\n", err);
}

static inline void unregister_as_ext3(void)
{
	unregister_filesystem(&ext3_fs_type);
}
5447 5448 5449 5450 5451 5452 5453 5454 5455 5456 5457 5458 5459

static inline int ext3_feature_set_ok(struct super_block *sb)
{
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
		return 0;
	if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
		return 0;
	if (sb->s_flags & MS_RDONLY)
		return 1;
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
		return 0;
	return 1;
}
5460 5461 5462
#else
static inline void register_as_ext3(void) { }
static inline void unregister_as_ext3(void) { }
5463
static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
5464 5465
#endif

T
Theodore Ts'o 已提交
5466 5467 5468
static struct file_system_type ext4_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "ext4",
A
Al Viro 已提交
5469
	.mount		= ext4_mount,
T
Theodore Ts'o 已提交
5470 5471 5472
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};
5473
MODULE_ALIAS_FS("ext4");
T
Theodore Ts'o 已提交
5474

5475
static int __init ext4_init_feat_adverts(void)
5476 5477 5478 5479 5480 5481 5482 5483 5484 5485 5486 5487 5488 5489 5490 5491 5492 5493 5494 5495 5496 5497 5498
{
	struct ext4_features *ef;
	int ret = -ENOMEM;

	ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
	if (!ef)
		goto out;

	ef->f_kobj.kset = ext4_kset;
	init_completion(&ef->f_kobj_unregister);
	ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
				   "features");
	if (ret) {
		kfree(ef);
		goto out;
	}

	ext4_feat = ef;
	ret = 0;
out:
	return ret;
}

5499 5500 5501 5502 5503 5504 5505
static void ext4_exit_feat_adverts(void)
{
	kobject_put(&ext4_feat->f_kobj);
	wait_for_completion(&ext4_feat->f_kobj_unregister);
	kfree(ext4_feat);
}

5506 5507 5508 5509
/* Shared across all ext4 file systems */
wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];

5510
static int __init ext4_init_fs(void)
5511
{
5512
	int i, err;
5513

5514 5515 5516
	ext4_li_info = NULL;
	mutex_init(&ext4_li_mtx);

5517
	/* Build-time check for flags consistency */
5518
	ext4_check_flag_values();
5519 5520 5521 5522 5523 5524

	for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
		mutex_init(&ext4__aio_mutex[i]);
		init_waitqueue_head(&ext4__ioend_wq[i]);
	}

5525
	err = ext4_init_es();
5526 5527
	if (err)
		return err;
5528 5529 5530 5531 5532

	err = ext4_init_pageio();
	if (err)
		goto out7;

5533
	err = ext4_init_system_zone();
5534
	if (err)
5535
		goto out6;
T
Theodore Ts'o 已提交
5536
	ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
5537 5538
	if (!ext4_kset) {
		err = -ENOMEM;
T
Theodore Ts'o 已提交
5539
		goto out5;
5540
	}
5541
	ext4_proc_root = proc_mkdir("fs/ext4", NULL);
5542 5543

	err = ext4_init_feat_adverts();
T
Theodore Ts'o 已提交
5544 5545
	if (err)
		goto out4;
5546

5547
	err = ext4_init_mballoc();
5548 5549
	if (err)
		goto out2;
5550 5551
	else
		ext4_mballoc_ready = 1;
5552 5553 5554
	err = init_inodecache();
	if (err)
		goto out1;
5555
	register_as_ext3();
5556
	register_as_ext2();
T
Theodore Ts'o 已提交
5557
	err = register_filesystem(&ext4_fs_type);
5558 5559
	if (err)
		goto out;
5560

5561 5562
	return 0;
out:
5563 5564
	unregister_as_ext2();
	unregister_as_ext3();
5565 5566
	destroy_inodecache();
out1:
5567
	ext4_mballoc_ready = 0;
5568
	ext4_exit_mballoc();
5569
out2:
5570
	ext4_exit_feat_adverts();
T
Theodore Ts'o 已提交
5571
out4:
5572 5573
	if (ext4_proc_root)
		remove_proc_entry("fs/ext4", NULL);
5574
	kset_unregister(ext4_kset);
5575
out5:
5576
	ext4_exit_system_zone();
5577
out6:
5578
	ext4_exit_pageio();
5579 5580 5581
out7:
	ext4_exit_es();

5582 5583 5584
	return err;
}

5585
static void __exit ext4_exit_fs(void)
5586
{
5587
	ext4_destroy_lazyinit_thread();
5588 5589
	unregister_as_ext2();
	unregister_as_ext3();
T
Theodore Ts'o 已提交
5590
	unregister_filesystem(&ext4_fs_type);
5591
	destroy_inodecache();
5592
	ext4_exit_mballoc();
5593
	ext4_exit_feat_adverts();
5594
	remove_proc_entry("fs/ext4", NULL);
T
Theodore Ts'o 已提交
5595
	kset_unregister(ext4_kset);
5596 5597
	ext4_exit_system_zone();
	ext4_exit_pageio();
5598
	ext4_exit_es();
5599 5600 5601
}

MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
5602
MODULE_DESCRIPTION("Fourth Extended Filesystem");
5603
MODULE_LICENSE("GPL");
5604 5605
module_init(ext4_init_fs)
module_exit(ext4_exit_fs)